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【单选题】
S-R变异是指( )A.
鞭毛变异
B.
耐药性变异
C.
毒力变异
D.
菌落变异
E.
结构变异
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皮皮学刷刷变学霸
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【单选题】British scientists said agers are programmed to take risks because they enjoy the thrill of
A.
30. British scientists said agers are programmed to take risks because they enjoy the thrill of erous situations________ others. A．more than
B.
less than
C.
other than
D.
rather than
【简答题】计算 （1）sin245°- cos60°+ tan60°cos230° （2）
【简答题】求值：sin 2 45°-cos60°+tan60°?cos 2 30°．
【简答题】1 4 ta n 2 45°+ 1 sin 2 30° -3co s 2 30°+ tan45° cos0° - sin40° cos50° ．
【简答题】计算题． （1） sin30°-cos45° cos60°-sin45° （2）（tan45°） 2 - cos 2 30°-2cos30°+1 ．
【单选题】Pupils usually would like to take ________ advice their teachers give.A．whicheverB．howeverC．what
A.
30. Pupils usually would like to take ________ advice their teachers give. A．whichever
B.
however
C.
whatever
D.
Whenever
【简答题】计算 si n 2 60°-tan30°cos30° tan45°-4co s 2 30° ．
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