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【单选题】
液压系统常出现的下列四种故障现象中,只有( )不是因为液压系统的油液引起的。A.
活塞杆爬行和蠕动
B.
液压元件内外泄露增加，油液加速氧化变质
C.
液压泵的吸油能力和容积效率降低
D.
系统工作不正常，压力、速度不稳定，动作不可靠
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【单选题】The earth is about ( ) as the moon.
A.
as fifty time big
B.
as big fifty times
C.
fifty as times big
D.
fifty times as big
【单选题】She told us that her brother ______ the Army for 3 years.
A.
had joined
B.
had been in
C.
joined
D.
has been in
【单选题】It was said that they _____ for twenty-five years.
A.
had got married
B.
had married
C.
married
D.
had been married
【单选题】The earth is about ___as the moon.
A.
as fifty time big
B.
fifty times as big
C.
as big fifty times
D.
fifty as times big
【单选题】下列哪一项不是小儿高热惊厥的临床特点()。
A.
惊厥多发生于4个月至3岁，最后复发年龄不超过6~7岁
B.
先发热后惊厥，多于发热初24h内的体温骤升期
C.
惊厥呈全身性，历时<10min，发作后不留下后遗症
D.
多伴有呼吸道、消化道感染，而无中枢神经系统感染
E.
发作后脑电图异常
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