下列参与构成尿生殖膈的肌肉有()
A． * * 括约肌
B．会阴浅横肌
C．会阴深横肌
D．球海绵体肌
E．坐骨海绵体肌
参考答案：A, C
__________ these tips, and your time _______ doing research on the Internet _________ much worthwhile.
A．Following, will spend, is
B．Followed, spent, was
C．Follow, spent, will be
D．To follow, spending, has been
已知2A+3B=C+3D，用足量的A和49g B恰好完全反应，其生成57g C和1g D，，若B的相对分子质量为98，则A的相对分子质量为（ ）
A．16
B．27
C．44
D．56
