实心桩用间隔重叠的方法预制,上层桩的浇灌,待下层桩的混凝土达到设计强度的( )以后进行。
A.20%
B.30%
C.50%
D.70%
参考答案:B
42. Which of the following groups is meat? _____
A.mutton, beef, chicken, fish
B.mutton, beef, chicken, pork
C.egg, beef, chicken, fish
D.mutton, beef, fish, pork
举例说明毒物代谢酶被诱导和抑制的毒理学意义。