FOCKE350小盒包装机压力传感器测出压缩空气压力不足或无压力则显示()故障。
A.气压不足
B.负压气压不足
C.主齿轮箱内的油压
D.气压高
参考答案:A
Have you heard that he, as well as his parents, ______ visited the Summer Palace?
—Really? No ______ he didn’t attend the meeting.
A.have; doubt
B. has; choice
C.have; reason
D.has; wonder
公元7世纪日本向中国隋唐学习的改革是:[ ]
A.大化改新
B.明治维新
C.孝文帝改革
D.王安石变法