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问题:

[单选] “The engine not obtaining the sufficient speed for firing” means that ().

A . the start fails
B . the fuel pumps will be put into operation
C . the fuel valves are damaged
D . the combustion process will take over

The height of tide is the (). depth of water at a specific time due to tidal effect。 difference between the depth of the water and the area's tidal datum。 difference between the depth of the water and the high water tidal level。 difference between the depth of the water at high tide and the depth of the water at low tide。 交通银行个人外汇期权业务是向个人客户提供()的买卖。 A.美式期权。 B.欧式期权。 C.亚式期权。 D.以上都不是。 炉门关闭完好以后,炉门的重量靠()来完全支撑。 炉门的导辊。 炉框的托架。 炉底的磨板。 羊角。 试述体育锻炼原则有哪些? 救助艇上配备太平斧2把,分别存放在艇的左右两舷。 “The engine not obtaining the sufficient speed for firing” means that ().
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