有多少电动马达控制安定面的液压电动马达（）.
A.1
B.2
C.3
参考答案：C
A US coal producer agreed to pay ________ total of $ 209 million for the mining accident that killed 29 people，________ worst such disaster in 40 years in the US.
A．the；the
B．a；a
C．the；a
D．a；the
戒烟：疾病
A.酒驾：事故
B.核对：差错
C.过失：反思
D.斟酌：顾虑
