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【单选题】
结构抗震动力试验可以分为周期性的动力加载试验和非周期性的动力加载试验，下列各项中，不以属于周期性的动力加载设备的是()。
A.
电液伺服加载器
B.
单项周期性振动台
C.
偏心激振器
D.
模拟地震振动台
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参考答案：
举一反三
【单选题】周期性瘫痪患者经常反复发作，发作间期（）.
A.
肌力多明显减低，伴尿、便障碍
B.
肌力多减退，伴肌肉萎缩
C.
肌力多正常，伴感觉减退
D.
肌力多正常
E.
肌力多正常，伴腱反射亢进
【单选题】The Grand Canyon Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant wound in the Earth’’s surface, a visitor might assume that the canyon had been caused by some ancient convulsion...
A.
it was caused by some ancient convulsion
B.
its presence is an embarrassment to the state of Colorado
C.
it looks like an injury on the Earth’s surface
D.
it has caused many visitors to injure themselves
相关题目：
【单选题】周期性瘫痪患者经常反复发作，发作间期（）.
A.
肌力多明显减低，伴尿、便障碍
B.
肌力多减退，伴肌肉萎缩
C.
肌力多正常，伴感觉减退
D.
肌力多正常
E.
肌力多正常，伴腱反射亢进
【单选题】The Grand Canyon Standing on the rim of the Grand Canyon(大峡谷), gazing across this giant wound in the Earth’’s surface, a visitor might assume that the canyon had been caused by some ancient convulsion...
A.
it was caused by some ancient convulsion
B.
its presence is an embarrassment to the state of Colorado
C.
it looks like an injury on the Earth’s surface
D.
it has caused many visitors to injure themselves
参考解析：
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