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【单选题】
甲烷的燃烧反应方程式为: CH 4 +aO2= CO 2 +bH 2 O ,其中 a 、 b 分别为A.
1 ， 2
B.
2 ， 1
C.
1 ， 1
D.
2 ， 2
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皮皮学刷刷变学霸
举一反三
【简答题】陈鹤琴提出了三种课程编制的方法,分别是圆周法、直进法和 _____________ 。
【简答题】若R3中曲面的所有曲线均为曲率线，则它为全脐的曲面．进而，若该曲面连通，则它为球面片或平面片．(参阅引理3．1．4．)
【单选题】The complete stress-strain curve of a material from the beginning of being loaded to the final rupture is shown in the following figure, the deformation process of the material is not _____.
A.
elastic and yield stage
B.
strain-hardening and necking stage
C.
yield and strain-hardening stage
D.
yield and necking stage
【单选题】Choose the correct words or phrases to complete the sentences. Our expectations further affect how we feel about lines. Uncertainty magnifies the stress of waiting, ____ feedback in the form of expect...
A.
because
B.
although
C.
if
D.
while
【单选题】甲单位与采购员某乙因矛盾解除代理关系,但有两份盖有甲公章的空白授权书未收回。乙为泄愤,持授权书向供应商丙、丁高价采购材料。丙丁均及时发货至施工现场。经査,丙不知乙离职,而丁明知乙离职。关于本案,说法正确的是()。
A.
甲有权拒绝向丙、丁承担责任
B.
由于甲单位存在过失，两份合同均属于表见代理
C.
由于乙行为违法，两份合同均属于无效合同
D.
甲对丙应承担付款义务
【单选题】As shown in the figure, there is a gap of depth of h/2in the tensile rod with rectangular cross-section. Compared with the complete rod without gap, the maximum stress of the one with gap is.
A.
doubled
B.
Four times
C.
Eight times
D.
Sixteen times
【简答题】Choose an appropriate word from the below given words to complete the following sentences. season weather coin value refrain province wake 1.There have been demondtrations in the stress in...
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