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【简答题】
设 是三条不同的直线， 是三个不同的平面，现给出四个命题： ①若 且 ，则 ； ②若 且 ，则 ； ③若 且 ，则 ； ④若 且 ，则 。 其中正确命题的序号是 。（把正确命题的序号都填上）
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反馈参考答案：
举一反三
【简答题】The basic insurance under the PICC Ocean Marine Cargo Clauses is classified into three conditions : ______, ______ and ______.
【单选题】The book ________ forty maps, ________ three of Great Britain. [ ]
A.
is containing; including
B.
contains; includes
C.
includes; containing
D.
contains; including
【单选题】There are three basic ways of _____ language to writing, and all known graphic systems use one or a combination of these.
A.
committing
B.
attaching
C.
comparing
D.
relating
【单选题】The three basic parts of any eductor are the nozzle, the suction chamber, and the ______.
A.
injector
B.
compressor
C.
diffuser
D.
siphon
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