血清淀粉酶正常值(Somogyi法U/dl)()。
A.20~40
B.40~180
C.180~250
D.250~300
E.300~350
参考答案:B
已知定义在R上函数f(x)是偶函数,对x∈R都有f(2+x)=-f(2-x),当f(-3)=-2 时,f (2007)的值为( )
A.2
B.-2
C.4
D.-4
—Let's play computer games.
—_______.[ ]
A. Yes, we do
B. Thank you
C. That sounds interesting
D. That's all right