以下符号中表示平行度的是（）

A . Pt B . Pz C . Ar D . Mz

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 . A、FU； B . B、HL； C . C、GB； D . D、KM。

A . A、R B . B、T C . C、了 D . D、K

A . A、41 B . B、H C . C、16 D . D、50

A . A、A B . B、B C . C、C D . D、D

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/image2/201707211620155817.jpg B .https://assets.asklib.com/images/image2/2017072116202886996.jpg C .https://assets.asklib.com/images/image2/2017072116204173007.jpg D .https://assets.asklib.com/images/image2/2017072116205323227.jpg

A . A、μ B . B、η C . C、α D . D、t

A .https://assets.asklib.com/images/image2/2017070109374532367.jpg B .https://assets.asklib.com/images/image2/2017070109374955095.jpg C .https://assets.asklib.com/images/image2/2017070109375455769.jpg D .https://assets.asklib.com/images/image2/2017070109380387652.jpg

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、FO B . B、FS C . C、FC D . D、QS

A . MOVB B . MOVW C . MOVD D . MOVR

A、GB/T B、GB/Z C、GB

A . A、FC B . B、FS C . C、QG D . D、QS

A . COD B . DO C . BOD D . TOD

A . TOC B . DO C . BOD D . TOD

A . A、∥ B . B、∠ C . C、⊥ D . D、〇

A . A.TIC B . B.TdRC C . C.PdC D . D.AC

A . M0+M1 B . M2+M4 C . M0 D . M1

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 . A、SW B . B、RW C . C、OD D . D、SO

以下表示管道的符号中表示是燃气管道的是：() A.W-D300 B.Y-D1000 C.D-1200X300 D.R-D160X9.1