正确答案: C

5x107

题目：高温下材料的疲劳强度用规定的循环周次下的疲劳强度表示，一般取( )次。

解析：C

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举一反三的答案和解析：

[单选题]If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at the

suction side of the fuel oil transfer pump

[单选题]In the Second paragraph, the underline word "Who", in such a context, stands for_____.

the Administration, the recognized organization or the nominated surveyor responsible for issuing the relevant Certificate

[单选题]当艇筏上的遇难人员乘登陆完毕后，离开难船的错误行动是：

与难船连在一起

[单选题]没有缩颈现象的金属材料是( )。

灰铸铁

[单选题]客船梯道的净宽度应不小于____mm，对于超过90人的情况，没超过1人则梯道的净宽度应至少增加_______mm

900/10

[单选题]大型十字头式柴油机活塞运动部件是靠导板、滑块起导向作用和承受侧推力，且_______较大，所以正常运转时活塞外圆表面不会产生磨损

活塞气缸间隙

[单选题]During the dock repair, when installing the tail shaft and propeller, _____ should be on the spot for supervising

chief engineer