12SH-28A型清水泵比转数为（）。
A.28
B.280
C.300
D.200
参考答案：B
a.c为( )。
A．双眼B．饭后C．隔日1次D．口服E．饭前
Your usual teacher has lost his voice and ______ I am taking his place today.
A．nevertheless
B．however
C．moreover
D．accordingly
