最大供油止挡是通过限制（）转动，达到限制最大供油量目的的。
A、喷油泵
B、喷油器
C、调速器
D、供油转轴
参考答案：D
October _____________ is the National Day of the PRC. [ ]
A. the first
B. the second
C. the third
Although China has developed its economy greatly, its per capital GDP is still
one-tenth of the United States.
A．slightly
B．separately
C．originally
D．roughly
