安装标高基准点应根据设备基础附近水准点,用水准仪测出的标志具体数值,相邻安装基准点高差应在( )mm以内。
A.0.3B.0.4C.0.5D.0.6
参考答案:C
The new model ________ the market in three months, all the shops are now selling the old model at a discount.
A.hitting
B.hit
C.having hit
D.to hit
请详述氯丙嗪的药理作用。