拖板箱内的安全离合器可在机动进给过程中起（）作用。
A.制动
B.保护
C.急停
D.过载
参考答案：B
船舶的紧急情况大致分为（）。
A、2类
B、4类
C、6类
Some of the objectives of the Grammar-Translation Method are______ and to train a better understanding of the first language.
A．to help students read literature
B．to make students exercise move
C．to provide students with good mental exercise
D．to have learners listen and speak more
