During the suction stroke, the piston is moving （）.

【名词&注释】

电化学(electrochemical)

[单选题]During the suction stroke, the piston is moving （）.

A. inwards
B. outwards
C. downwards
D. upward

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[单选题]曲轴轴颈的腐蚀主要是（）腐蚀。

A. 化学
B. 电化学
C. 静电
D. 电化学和静电

[单选题]It is important that the water （） very often as this can lead to increased deposits.

A. not be changed
B. be changed
C. should not be changed
D. should be changed

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