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【判断题】
软齿面(硬度≤ 350HBS )的齿轮传动, 齿面点蚀将是主要的失效形式。在设计计算时,通常按齿面接触疲劳强度设计,再作齿根弯曲疲劳强度校核。A.
正确
B.
错误
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【简答题】生产餐饮产品的原料大多是鲜货原料，极容易[填空(1)]。
【单选题】If a 1 kg mass is dropped to the floor from a height of 5 m, what is the approximate velocity once it reaches the ground?
A.
10 m/s
B.
5 m/s
C.
1 m/s
D.
100 m/s
【单选题】Particle 1 of mass m 1 = 6.0kg, particle 2 and 3 of mass m 2 = m 3 = 4.0kg, and distance a = 2.0cm. What is the net gravitational force (its magnitude and direction) on particle 1 due to the other par...
A.
F 1,net = 5.1x10 -6 N, θ = 104 o
B.
F 1,net = 4.1x10 -6 N, θ = 104 o
C.
F 1,net = 4.1x10 -6 N, θ = 204 o
【简答题】在对供应链进行构建时应注意考虑 ________ 、 ________ 、 ________ 等方面的问题。
【简答题】生产餐饮产品的原料大多是鲜货原料，极容易（）。
【单选题】配制2%盐酸普鲁卡因溶液1000ml,需加( )g氯化钠使成等渗溶液(1%盐酸普鲁卡因的冰点降低值为0.12°C)
A.
8.4
B.
4.8
C.
6.5
D.
2.4
【单选题】According to Dr. Mass, the Cornel psychologist, which of the following is NOT correct?
A.
People should take napping as a daily activity.
B.
Naps strengthen the ability to pay close attention to details.
C.
We should sleep for eight hours during the night.
D.
It's much helpful to nap for twenty minutes during the day than to sleep twenty minutes more than usual during the night.
【简答题】与模拟电路相比,数字电路具有哪些优点?
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