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【判断题】
大多单子叶植物,其内皮层的细胞壁在发育早期为凯氏带形式,以后进一步发育为五面加厚,即上、下壁,径和内切全面加厚,在横切面上细胞壁呈马蹄形。A.
正确
B.
错误
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【单选题】Hurry up! They ______ for us now.
A.
Must waiting
B.
ought to wait
C.
must be waiting
D.
must have waited
【单选题】Will Quality Eat up the US Lead in Software? If US software companies don't pay more attention to quality, they could kiss their business good-bye. Both India and Brazil are developing a world-class s...
A.
India.
B.
The US.
C.
Brazil.
D.
Germany.
【单选题】Hurry up! Our friends ______ for us now.
A.
wait
B.
are waiting
C.
will wait
D.
have waited
【简答题】He's left now, but productivity hasn't ______that much. A: carried on B; caught up C; picked up
【单选题】- What's up? You didn't pick up the phone just now. - I'm sorry that I dancing with music on, but it's done now.
A.
practised
B.
was practising
C.
am practising
D.
have practlised
【单选题】在两个部件之间添加配合约束的时候,哪一个部件会从先前的位置移动到满足装配关系的位置?( )
A.
都移动
B.
都不移动
C.
第一个被选择的部件
D.
第二个被选择的部件
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【简答题】He's left now, but productivity hasn't ______that much. A: carried on B; caught up C; picked up
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