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【简答题】
两构件通过面接触组成的运动副称为 ____,平面机构中按构件的相对运动形式又可将其分为 ____和 ____。 通过点或直线接触组成的运动副称为 ____。
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举一反三
【单选题】A multimeter with a range of 50 V and a minimum scale of 1 V was applied to measure the voltage of a resistance in a circuit. The accuracy class of the multimeter was 1. The measured voltages were 20....
A.
21.4±1 V
B.
21.4±0.6 V
C.
21..4±0.4 V
D.
21.4±0.5 V
【单选题】When a given op-amp has a common-mode input of 10 V, the output of the device is 10 V. When the device has a differential input of 2 mV, the output of the device is 10 V. What is the CMPR of the devi...
A.
5 : 1
B.
5000 : 1
C.
1000 : 1
D.
5,000,000 : 1
【单选题】The benefit of measuring the initial rate of a reaction V 0 is that, at the beginning of a reaction:
A.
[ES] can be measured accurately.
B.
changes in [S] are negligible, so [S] can be treated as a constant.
C.
changes in K m are negligible, so K m can be treated as a constant.
D.
V 0 = V max .
E.
varying [S] has no effect on V 0 .
【单选题】What is the difference of the language of a child of four from that of his parents?
A.
The vowel sounds.
B.
The grammar.
C.
The style.
D.
The vocabulary.
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