下列哪种是首选降压药（）
A.肼苯哒嗪
B.卡托普利
C.心痛定
D.甲基多巴
E.多巴胺
参考答案：A
On his 10th birthday, Marty manages to escape from the zoo and gets onto the subway, _____ he believes
that he can go to the wild.[ ]
A. which
B. from what
C. through which
D. that
在斜刃剪板机中，除（）可调外，去他参数在一种型号的龙门剪板机上，都是固定不变的。
A.剪切角
B.剪刃间隙
C.前角
