【单选题】Intelligent use of the muscles means that ______ .
A.
one always knows what his muscles are doing
B.
one performs simple actions without working
C.
one's muscles are used only to the extent necessary for each action they perform
D.
one improves muscular action consciously
【单选题】What will our future ______? No one knows _______. [ ]
【判断题】渐开线上各点的压力角不同,其中基圆上的压力角为0。()
【单选题】爱迪生在发明电灯之前做了两千多次实验,有个记者曾经问他为什么遭遇这么多次失败, 爱迪生回答:“我一次都没有失败,我发明了电灯。这只是一段经历了两千步的历程。”爱迪生之所以说 “我一次都没有失败”,是因为他把每一次实验都看作是
【单选题】No one but you knows your heart is racing, so take a breath and try to ________ down. [ ]
【单选题】No one knows ____________ in fifty years.
A.
what will our life be like
C.
what our life will be like
【单选题】爱迪生在发明电灯之前做了两千多次实验,有个记者问他为什么遭遇这么多次的失败,爱迪生回答:“我一次都没有失败。我发明了电灯。这只是一段经历了两千步的历程。”爱迪生之所以说“我一次都没有失败”,是因为他把每一次实验都看作()