单项选择题

能使等式(1)R+(11)R=(100)R成立的数制R是()。 A.
十六进制 B.
十进制 C.
八进制 D.
二进制

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A 40-year-old woman went to a clinic to manage her obesity. The doctor advised her to eat less and exercise more. Which of the following has the most significant effect on energy metabolism?

A．Mental stress
B．Muscle activity
C．Environmental temperature
D．Thermogenic effect of food
E．Sex Hormone

单项选择题

尺寸φ50f6，f6表示（）。

A.公差带图
B.孔的公差带代号
C.轴的公差带代号
D.A.B.C都不对