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【单选题】
按照DL/T827-2002《灯泡贯流式水轮发电机组启动试验规程》规定，灯泡贯流式水轮发电机组启动试验前，水轮机的检查包括（）。A.
检修密封经漏气试验合格，充水前检修密封的空气围带处于充气状态；
B.
各部件之间（包括转轮室与外导环、外导环与外壳体、内锥体与内导环、内导环与内壳体等）的密封均已检验合格，无渗漏情况；
C.
所有分瓣部件的各分瓣法兰均已把合严密，符合规定要求。
D.
。
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【简答题】every now and then
【单选题】我们应该明白,年轻人时不时地犯错是很正常的。
A.
We need to understand that it’s common for young people to make mistakes every now and then.
B.
We need to understand for young people to make mistakes every now and then.
C.
We need to understand that it’s common for young to make mistake every now and then.
D.
We need to understand that it was common for young people to make mistakes every now and then.
【单选题】__________I see him, he looks sad.
A.
Every now and then
B.
Every now and again
C.
Every so often
D.
Every time
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