按GB/T12754-1991生产的彩色涂层钢板,分为()。
A.建筑内用
B.建筑外用
C.汽车工业
D.家用电器用
参考答案:A, B, D
–We can use it to chat with each other on the Internet.
--Really? Will you please show me _______ it
A.how to use
B.what to use
C.how can I use
D.what can I use
二羟丙茶碱的疗效约为氨茶碱的()
A.1/2
B.1/3
C.1/5
D.1/8
E.1/10