用麻花钻头钻硬材料时,其顶角要比钻软材料时选得大。
参考答案:错
Listening 3 "Philosophy Class"
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What does the professor mean when she says this:
A. She is expressing p agreement.B. She is introducing doubt.C. She is maintaining a neutral position.D. She is asking the students to agree.
有关骨盆骨折合并 * * 损伤及失血性休克的正确处理程序是()
A.骨盆骨折-- * * 损伤--休克
B.休克-- * * 损伤--骨盆骨折
C.休克--骨盆骨折-- * * 损伤
D. * * 损伤--休克--骨盆骨折
E.同时处理 * * 损伤和休克、骨盆骨折