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【多选题】
根据市场调查性质分,市场调查方案一般有( )。A.
探索性调查方案
B.
描述性调查方案
C.
因果性调查方案
D.
总结调查方案
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【单选题】British scientists said teenagers are programmed to take risks because they enjoy the thrill of
A.
30. British scientists said teenagers are programmed to take risks because they enjoy the thrill of dangerous 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】计算：（1）sin 2 45°-cos60°+tan60°cos 2 30°； （2） tan60°-sin60° cos 2 45°- 1 2 tan45°+tan60° ．
【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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