单项选择题
Please adjust the derrick （）(向下).
A.upwards B.downwards C.forwards D.backwards
单项选择题 The （）(箱装货) should be handled by cargo tray.
单项选择题 The （）(侧稳索) has gone wrong.
单项选择题 Adjust the （）(中心稳索), please.
