属分泌性酶的是（）
A.胆碱酯酶
B.淀粉酶
C.丙氨酸氨基转移酶
D.乳酸脱氢酶
E.肌酸激酶
参考答案：B
He had his leg broken in the basketball match. __ _, he has to be away from school for a couple of weeks.
A．For example
B．After all
C．At first
D．As a result
主再热蒸汽两侧温差≤（）℃。
A、5
B、10
C、15
D、20
