实测迳流资料时，主要采用（）方法推算设计年迳流量。

【名词&注释】

经济性(economy)、动力装置(power plant)、机动性(mobility)、基本要求(basic requirements)、说明书(specification)、续航力(endurance)、巴氏合金(babbitt alloy)、等值线图法、铜铅合金(copper-lead alloy)、频率计算法(frequency analysis method)

[单选题]实测迳流资料时，主要采用（）方法推算设计年迳流量。

A. 等值线图法
B. 水文比拟法
C. 频率计算法^{(frequency analysis method)}

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学习资料：

[单选题]对商船动力装置的基本要求是（）。

A. 经济性、可靠性
B. 机动性、续航力
C. 尺寸与重量
D. A+B+C

[单选题]按照说明书的规定，（）进行一次（）螺栓预紧力的检查。

A. 半年/连杆
B. 一年/连杆
C. 半年/贯穿
D. 一年/贯穿

[单选题]油润滑艉轴承的轴承材料一般选用（）。

A. 巴氏合金^{(babbitt alloy)}
B. 铜铅合金^{(copper-lead alloy)}
C. 铜锡合金
D. 高锡铝合金

[单选题]A high temperature alarm or （） which will melt is used to guard against the explosion of compressor air pipelines.

A. a flame trap
B. a relief valve
C. a fusible plug
D. a bursting ca

[单选题]Please draw out a 01 mm （） between the two halves of the bearing to reduce the clearance.

A. shim
B. gasket
C. washer
D. packing

[单选题]The oil quantity for bearing lubrication should be applied in such an amount as to be sufficient to carry away the （） caused by the friction at the bearings.

A. acids
B. additives
C. heat
D. gear

[单选题]As to the bearing, of the following, which statement is not true?（）

A. ff overheat is found, the engine must be stopped for inspection
B. Much heat of the crankcase door indicates that the bearing is overheated
C. If bearing clearance is too large, knocking will be heard in the crankcase
D. If bearing clearance is too large or too small, the white metal may be melted

[单选题]Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of （）.

A. 10
B. 7
C. 4
D. 1

[单选题]Turbulence in a diesel engine cylinder is of major importance in providing （）.

A. proper fuel metering
B. complete fuel/air mixing
C. minimal fuel penetration
D. proper fuel timing

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