下列图形符号（）是可控硅符号。

A .https://assets.asklib.com/images/image2/201707211449324099.jpg B .https://assets.asklib.com/images/image2/20170721144949173.jpg C .https://assets.asklib.com/images/image2/2017072114500678859.jpg D .https://assets.asklib.com/images/image2/2017072114502813596.jpg

A . A.民族图形中的 B . B.科学领域中的 C . C.解剖图例中的 D . D.音乐领域中的

A . 基极 B . 发射极 C . 集电极 D . 控制极

A .https://assets.asklib.com/images/image2/2017072116174478245.jpg B .https://assets.asklib.com/images/image2/2017072116174781614.jpg C .https://assets.asklib.com/images/image2/2017072116175044952.jpg D .https://assets.asklib.com/images/image2/201707211617557509.jpg

A .https://assets.asklib.com/images/image2/2017042708575973433.jpg B .https://assets.asklib.com/images/image2/2017042708581480491.jpg C .https://assets.asklib.com/images/image2/2017042708581899534.jpg D .https://assets.asklib.com/images/image2/2017042708582249481.jpg

A . 本船航迹 B . 浅水区域强调显示 C . 根据穿越安全等深线的时间提前量值标绘的警戒矢量 D . 根据偏航报警距离值标绘的偏航带

A . 一端 B . 二端 C . 三端 D . 四端

A .https://assets.asklib.com/images/image2/2017072116170484808.jpg B .https://assets.asklib.com/images/image2/2017072116170747836.jpg C .https://assets.asklib.com/images/image2/2017072116171026177.jpg D .https://assets.asklib.com/images/image2/2017072116171489377.jpg

A .https://assets.asklib.com/images/image2/2017051513455319425.jpg B .https://assets.asklib.com/images/image2/2017051513455624169.jpg C .https://assets.asklib.com/images/image2/2017051513460062605.jpg D .https://assets.asklib.com/images/image2/2017051513460366441.jpg

A . 符号框的颜色取决于所选择的警告词 B . 危险标志的符号框应为红底黑字 C . 警告标志的符号框应为桔黄色底黑字 D . 注意标志的符号框应为黄底黑字

A . 气体液体球阀 B . 密闭式安全泄放阀 C . 安全切断阀 D . 自立式调压阀

A .https://assets.asklib.com/psource/79421447750043049.png B .https://assets.asklib.com/psource/79681447750054427.png C .https://assets.asklib.com/psource/99771447750067979.png D .https://assets.asklib.com/psource/65781447750080918.png

A . A、A B . B、B C . C、C D . D、D

A .https://assets.asklib.com/images/image2/2017072114513717719.jpg B .https://assets.asklib.com/images/image2/201707211451538398.jpg C .https://assets.asklib.com/images/image2/2017072114520776285.jpg D .https://assets.asklib.com/images/image2/2017072114522672107.jpg

A . A、晕线 B . B、简单图形 C . C、象形图形 D . D、以上都不是

A . GTR B . IGBT C . MOSFET D . SCR

A .https://assets.asklib.com/images/image2/2017051513352826640.jpg B .https://assets.asklib.com/images/image2/2017051513353382767.jpg C .https://assets.asklib.com/images/image2/2017051513353792093.jpg D .https://assets.asklib.com/images/image2/2017051513354177374.jpg

A .https://assets.asklib.com/images/image2/2017072116143078507.jpg B .https://assets.asklib.com/images/image2/2017072116144868939.jpg C .https://assets.asklib.com/images/image2/201707211615045623.jpg D .https://assets.asklib.com/images/image2/201707211615225203.jpg

A .https://assets.asklib.com/images/image2/201707211626504873.jpg B .https://assets.asklib.com/images/image2/2017072116270999091.jpg C .https://assets.asklib.com/images/image2/2017072116272367986.jpg D .https://assets.asklib.com/images/image2/2017072116273666707.jpg

A．包含一个警告词的安全标志图形符号框应为白底黑图 B．包含安全警告三角形或轮廓式安全警告符号的安全标志图形符号应为黄底黑图 C．其他颜色（例如：红色代表火）可用来强调图形符号的特殊方面 D．如果用×、 或者表示禁止行为的文字（见附录D中D.9），这些符号应为红色

A．常闭触点 B．常开触点 C．复合触点 D．常闭触点

A．<img src='https://img2.soutiyun.com/shangxueba/ask/2022-01/18/577/20220118171545986.jpg' /> B．<img src='https://img2.soutiyun.com/shangxueba/ask/2022-01/18/68/20220118171610978.jpg' /> C．<img src='https://img2.soutiyun.com/shangxueba/ask/2022-01/18/1374/20220118171740993.png' /> D．<img src='https://img2.soutiyun.com/shangxueba/ask/2022-01/18/726/2022011817164855.jpg' />