使用人力制动机调节溜行车组的速度,使其溜至指定地点停车或与停留车安全连挂称为间隔制动。
参考答案:错
—Who is the man talking to the detective?
—Maybe he is one of the ________ who is asked to tell what he saw. [ ]
A. witness
B. suspects
C. actress
—_____ is your mother?
—She is _____ English teacher. [ ]
A. Who; the
B. What; /
C. What; an
D. Who; a