正确答案: A
长度<1/4公称直径、深度<10%公称直径
题目:舵杆上()的纵向裂纹可焊补修理。
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学习资料的答案和解析:
[单选题]The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives themThe difference is termed ().
nip
[单选题]The hand steering is a method by which the motion of the rudder is controlled with ().
a hand-driven steering wheel