急性心肌梗死时，哪种血清酶持续时间最长
A．CPK
B．LDH
C．AKP
D．ASL
E．ALT
参考答案：B
小数加减法的运算顺序同整数加减法的运算顺序相同，都是从左往右按顺序计算．______．
Peter ________ the papers he was marking and reached for his cigarettes and matches.
A．set out
B．set off
C．set in
D．set aside
