Tom _____ play football but he can't play basketball. [ ]
A. can't
B. can
C. must
答案:B
高级程序设计语言是( )。
A.2GL
B.3GL
C.4GL
D.5GL
在心动周期中,房室瓣开放始于
A.等容舒张期末B.快速充盈期末C.减慢充盈期末D.心房收缩期初