cos120°=()。
A、1
B、1.414
C、-1.732
D、-0.5
参考答案:D
This pair of shoes doesn't look good, but that pair is ____ better, I think.
A.rather
B.less
C.even
D.hardly
堤坡渗水抢护的原则是“临河截渗,背水导渗”其中临河截渗方式有()。
A.临水筑戗
B.抛填粘土
C.土工膜截渗
D.滤层铺筑