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[单选题]串联连接系统的可靠度()组成该系统各部件的可靠度。
A. 等于
B. 大于
C. 小于
D. 大于、等于
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[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
[单选题]The cylinder covers and the liners are bolted together by means of studs () the cylinder frames.
A. screwing into
B. being screw on
C. to screw on
D. screwed into
[单选题]If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe ().
A. high steam pressure in the boiler
B. abnormally high feed water temperature
C. abnormally high boiler water temperature
D. steam demand exceeding feed pump capacity
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