5-1.Which is the normal catalyst for fuel cells in anode?

A . An amount equal to the depth of the water B . Two times the depth of water C . Three to four times the depth of water D . Five to seven times the depth of water

A . low steel on the Huey P. Long Bridge B . mean sea level C . the local water table D . the minimum dam control level

A . center of gravity is lowered B . center of buoyancy is lowered C . reserve buoyancy is unchanged D . hull freeboard is increased

A . 20 to 30 B . 200 C . 100 D . 450

A . along the turn of the bilge B . along each side of the keel C . near the top of the gunwale D . at the bow and at the ster

A . to work as overload characteristic B . overspeed C . over mechanical load only D . over thermal load only

A . dirty delivery ducts B . too much refrigerant C . the fouling filters D . high temperature outside

A . Completed， Deposited， Released， Shipped B . Completed， Released， Shipped， Deposited C . Deposited， Released， Shipped， Completed D . Released， Shipped， Completed， Deposited E . Released， Shipped， Deposited， Completed

A . fixed B . matched C . fitted D . equal

A . secure the electric supply B . ventilate area to remove smoke C . start the fire pump and lead out hose D . apply foam

A . 14 hours B . 10 hours C . 6 hours D . It does not matter as long as my overtime is paid for

A . Carry out soot blowing if permissible B . Change fuel supply to diesel oil C . Close steam stop valves on boiler when pressure is reduced D . Drain boiler empty when it has cooled dow

A . Hull B . Cargo C . Protection and Indemnity D . Pollutio

A . refrigerant overcharge B . overfeeding by the expansion valve C . a restricted suction strainer D . due to short cycling of the compressor

A．35km B．70km C．50km

The question is no mere academic one. The ease with【5】people can change from working in the day to working at night is a【6】of growing importance in industry where automation【7】round-the-clock working of machines. It normally【8】from five days to one week for a person to adapt to a【9】routine of sleep and wakefulness, sleeping【10】the day and working at night.【11】it is often the case in industry that shifts are changed every week. This【12】that no sooner has he got used to one routine【13】he has to change to another,【14】much of his time is spent neither working nor sleeping very【15】 One answer would seem to be【16】periods on each shift, a month, or even three months.【17】, recent research has shown that people on such systems will revert to go back to their【18】habits of sleep and wakefulness during the week-end and that this is quite enough to destroy any 【19】to night work built up during the week. The only real solution appears to be to hand over the night shift to those permanent night workers whose【20】may persist through all week-ends and holidays. (1) A．allegation B．alternation C．allocation D．alternative

A．.0401. B．.9599. C．.4599 D．1.4599.

A．12-20 per minute B．14-20 per minute C．18-24 per minute D．12-18 per minute

A、The mean of the individual random variables B、The variance of the individual random variables C、The correlation between individual random variables