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【单选题】
一弹簧振子作振动, 总能量为E, 若振动振幅为原来的2倍,重物的质量增加为原来的4倍,则它的总能量为()
A.
2E
B.
4E
C.
8E
D.
16E
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A.
正确
B.
错误
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A.
全控型
B.
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C.
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A.
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B.
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C.
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D.
自强自立的竞争意识
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A.
Filter the incoming air
B.
Prevent explosions
C.
Prevent backups
D.
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【单选题】“提运单号”栏:
A.
11/LJA-SRD/INV/II/2010
B.
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C.
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D.
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【单选题】食品中粗蛋白质测定方法中,最为经典的测定方法是:
A.
凯氏定氮法
B.
双缩脲法
C.
紫外分光光度法
D.
水杨酸比色法
【单选题】如图∠AOP=∠BOP=15 o ,PC∥OA,PD⊥OA,若PC=10,则PD等于   【   】
A.
5
B.
C.
10
D.
2.5
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