皮皮学，免费搜题
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【简答题】
动力制动系包括 ，气顶液制动系 和全液压动力制动系三种。
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】—We’ve spent too much money recently. —Well, it isn’t surprising, Our friends and relatives_______ around all the time.
A.
are coming
B.
had come
C.
were coming
D.
have been coming
【单选题】—Have you finished your homework? —I've done most of it. But the rest ______ too difficult. [ ]
A.
are
B.
has
C.
will be
D.
is