压力容器有十种设计准则，它们分别是：1.______________；2._____________； 3._____________；4.________________；5._______________；6.________________；7._______________；8.______________；9._____________；10._______________;

根据课文内容填空，再认真读一读。1．_____________就像蝙蝠的嘴。2．_____________就像蝙蝠发出的超声波。3．_____________就像蝙蝠的耳朵。

提出问题,并解答问题.白兔说,我拔了7个萝卜.灰兔说,我拔了9个萝卜.兔妈妈说,我拔了12个萝卜.1._____________?口O口=口2._____________?口O口=口

Watch the interview with Audrey Hepburn and complete the short passage by filling the blanks with only one word.When coming up to the plea thatAudrey Hepburn wants to make the public, she says she hopes that people will understand that once again there's a 1. _____________ in Africa which is potentially much 2._____________ than last time. 3.______________ is everywhere helping them and it tends to give people a spade to dig their water 4._____________, but not the 5._______________ for their children.

【单选题】NO 2 、NO 2 - 、NO 2 + 键角大小关系正确的是 。 A. NO 2 > NO 2 - >NO 2 + B. NO 2 + >NO 2 >NO 2 - C. NO 2 - > NO 2 >NO 2 + D. NO 2 + > NO 2 - >NO 2

求定积分[img=179x43]17da65388c0b1ca.png[/img]； （ ） A: log(2^(1/2) + 1)/2 + 2^(1/2)/2 B: log(2^(1/2) + 1)/2 - 2^(1/2)/2 - 1/2 C: log(2^(1/2) + 1)/2 + 2^(1/2)/2 - 1/2 D: log(2^(1/2) + 1)/2 + 2^(1/2)/2 + 1/2

2 + 2 * (2 * 2 - 2) % 2 / 3

函数z=xsiny在点(1,π/4)处的两个偏导数分别为 A: √2/2,√2/2 B: √2/2,-√2/2 C: -√2/2,-√2/2 D: -√2/2,√2/2

2×2×2×2×2

HbF的构成主要是（） A: α2β2 B: α2δ2 C: ζ2ε2 D: α2γ2 E: ζ2γ2