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【简答题】
某企业生产中使用的A标准件既可自制也可外购。若自制，单位成本为6元，每次生产准备成本500元，日产量40件；若外购，购入价格是单位自制成本的1.5倍，一次订货成本20元。A标准件全年共需耗用7200件，储存变动成本为标准件价值的10％，假设一年有360天。计算自制和外购方案的经济订货批量，并判企业应自制还是外购A标准件？（计算结果保留整数）
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【单选题】Hardly the helicopter _______ when the waiting crowd ran toward it.
A.
had...landed
B.
has...landed
C.
did...landed
D.
was... landing
【单选题】According to gyroscopic precession, if the rotor disc wants to tilt forward, which direction the pitch angle has to increase? Assuming the main rotor rotates counterclockwise,and 3-o'clock is on the r...
A.
3-o'clock
B.
6-o'clock
C.
9-o'clock
D.
12-o'clock
【简答题】Hardly ________ the helicopter ________ when the waiting crowd ran toward it. A) had ..., landed B) has ..., landed C) did..., land D) was..., landing
【单选题】A small fuel spillage has occurred during helicopter refueling. After the leak has been stopped and fire-control personnel have been notified and are standing by，the next step is to（）.
A.
proceed with fueling operation
B.
have helicopter move to a safer location
C.
wash spilled fuel away with a flood of water
D.
clean spilled fuel with rags
【单选题】The FBI has been called in to help __________ the tragic helicopter crash that killed NBA champion Kobe Bryant, and his teenage daughter.
A.
neglect
B.
investigate
C.
insert
D.
emerge
【简答题】Hardly ________ the helicopter ________ when the waiting crowd ran toward it. A) has ... landed B) had ... landed C) would ... land D) was ... landing
【单选题】Hardly_____ the helicopter______ when the waiting crowd ran towards it.
A.
has…landed
B.
had…landed
C.
would…land
D.
was…landing
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