Do you know how popcorn at home? [ ]
A. make
B. to make
C. do
D. to do
答案:B
材料科学的基本原理?举例说明。
正常人体温可有波动,但24小时内波动幅度一般不超过()
A.0.5℃
B.1℃
C.1.5℃
D.2℃
E.>2℃