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【单选题】
除工艺原因外,柴油机气缸套与活塞环工作表面间油膜变薄或遭到破坏,是由于_________等因素造成。1.润滑不良2.活塞运动装置的对中不良3.冷却不良4.超负荷5.工作表面粗糙度低A.
①②④⑤
B.
①④⑤
C.
①②③④
D.
①②③
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举一反三
【单选题】- Mum, may I go swimming now? -Yes, dear, but remember that you go with your dad.
A.
may
B.
can
C.
must
【单选题】— May I go swimming now? — No, you ______. You must finish your homework first. [ ]
A.
mustn't
B.
may not
C.
couldn't
D.
needn't
【单选题】–Mom, may I go swimming with my friends in the river? –No, you _________. That’s too dangerous.
A.
won’t
B.
don’t
C.
needn’t
D.
mustn’t
【单选题】– May I go swimming in the lake, Mum? – No, you . It’s too dangerous.
A.
mustn’t
B.
may not
C.
won’t
D.
needn’t
【单选题】--Mom,may I go swimming now? --Yes,dear,but remember that you __go with your dad.
A.
may
B.
can
C.
must
【单选题】关于小儿单纯性肥胖症，以下哪种说法是不正确的
A.
我国儿童单纯性肥胖症的发病率呈增加趋势
B.
单纯性肥胖症患儿热量摄入超过消耗，导致体内脂肪积聚过多
C.
一般认为，小儿单纯性肥胖症与成人肥胖无明显关系
D.
单纯性肥胖症是一种热能代谢障碍性疾病
E.
单纯性肥胖症与成人肥胖症、高血压、糖尿病等有一定关系，应给予重视
【单选题】----May I go swimming this afternoon? ----I'm afraid not _______ you have finished your homework.
A.
unless
B.
because
C.
if
D.
though
【单选题】—May I go swimming this afternoon? — I'm afraid not _______ you have finished your homework.
A.
if
B.
unless
C.
because
D.
but
【单选题】—Mum, may I go swimming now? —Yes, dear, but remember that you _______ go with your dad.
A.
may
B.
can
C.
must
D.
/
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