单项选择题斯特恩实验室什么时候做的?()
A、1910
B、1920
C、1915
D、1923
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1.判断题仓储合同不是双务合同。()
3.单项选择题振荡的偶极子发射电磁波需要具备的条件为()。
A、电路的振荡频率高
B、电路为开放电路
C、电路为封闭电路
D、A和B
7.炎热环境中,机体维持体热平衡的机制主要是
A.增加有效辐射面积及降低环境温度
B.发汗及增加皮肤血流量
C.增加皮肤与环境之间的温度差
D.发汗及减少皮肤血流量
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