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【多选题】
关于岩石的软化性和抗冻性的说法正确的是（ ）A.
岩石的软化性是指岩石在水饱和状态下与干燥状态下试件单向抗压强度之比
B.
岩石的软化性是判定岩石耐风化、耐水浸能力的指标之一
C.
软化系数大于0.75的岩石，其抗水、抗风化和抗冻性较差
D.
岩石的抗冻性是指它抵抗抗冻融破坏的性能
E.
岩石抗冻性取决岩石开型孔隙的发育程度、亲水性和可溶性矿物含量及矿物颗粒间联结强度
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举一反三
【单选题】同源染色体联会,同源染色体中非姐妹染色单体出现交叉发生在细胞减数分裂的哪一个阶段
A.
第一次减数分裂前期
B.
第二次减数分裂前期
C.
第一次减数分裂中期
D.
第二次减数分裂中期
E.
第一次减数分裂后期
【单选题】Passage Three You never see him, but they're with you every time you fly. They record where you are going, how fast you're traveling and whether everything on your airplane is functioning normally. Th...
A.
15. What do we know about the black boxes from Air France Flight 447? A) There is still a good chance of their being recovered.
B.
B) There is an urgent need for them to be reconstructed.
C.
C) They have stopped sending homing signals.
D.
D) They were destroyed somewhere near Brazil.
【简答题】What is the best bet to deal with different denominations?
【单选题】一对称波导, 。要使 1.5 μm 的光波在该波导中仅存一个 TE 模,该波导的最大厚度为多少?
A.
4.36 μm
B.
3.10 μm
C.
1.55 μm
D.
2.18 μm
【简答题】You never see them, but they're with you every time you fly. They record where you're going, how fast you're traveling and whether everything on your airplane is functioning normally. Their ability to...
【单选题】Passage Three You never see him, but they're with you every time you fly. They record where you are going, how fast you're traveling and whether everything on your airplane is functioning normally. Th...
A.
11. What does the author say about the black box? A) It ensures the normal functioning of an airplane.
B.
B) The idea for its design comes from a comic book.
C.
C) Its ability to ward off disasters is incredible.
D.
D) It is an indispensable device on an airplane.
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