During inspection of the machinery space, which of the following statements points to an unsatisfactory organization of the systematic maintenance?()
A. missing valve hand wheels
B. dirty tank tops
C. a large number of temporary repairs
D. All of the above
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清算备付金管理遵循()的原则。
A. 归口管理
B. 分级负责
C. 逐级核对
D. 自由调度
足球运球测试器材包括足球若干个、秒表()。
A. 7根标志杆
B. 橡皮筋
C. 30米卷尺
D. 5根标志杆