问题
单项选择题
抗冻等级是指混凝土28天龄期试件在吸水饱和后所能承受的最大冻融循环次数，其前提条件是
A.抗压强度下降不超过5%，重量损失不超过25%
B.抗压强度下降不超过10%，重量损失不超过20%
C.抗压强度下降不超过20%，重量损失不超过10%
D.抗压强度下降不超过25%，重量损失不超过5%
答案
参考答案：D
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抗冻等级是指混凝土28天龄期试件在吸水饱和后所能承受的最大冻融循环次数，其前提条件是
A.抗压强度下降不超过5%，重量损失不超过25%
B.抗压强度下降不超过10%，重量损失不超过20%
C.抗压强度下降不超过20%，重量损失不超过10%
D.抗压强度下降不超过25%，重量损失不超过5%
参考答案：D
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| An old tiger lives in the forest. He seldom (很少) goes to look for food himself. He orders (命令)other animals to _1_ him something to eat. One day he sees a monkey and says, " I'm __2_ , Monkey. Go to the village and bring me a fat pig." "Oh, Tiger," says the monkey. " I __3_ do that. There 4 _ another tiger over there. He also wants a fat pig. He will not let me do anything __5_  you. I am afraid of him." "What?" cries the tiger. "Show _6_ that tiger. I will talk to him." "Come _7_ me, then." Says the monkey. The monkey and the tiger get to a bridge above the river. "Now look down _8 the river." Says the monkey. "Do you 9 the head, the white teeth and large green eyes of a tiger?" "Yes, I do," cries the old tiger. "I will eat him up." With these words the tiger 10_ the river.
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