题目内容

One advantage of mother’s milk to the baby is rich source of docosahexaenoic acid.

A. 对
B. 错

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The foods pyramid for older adult is wider than that for the young adults

A. 对
B. 错

Dehydration is not a big concern of the older adults

A. 对
B. 错

正弦交流电压u=220sin(ωt-40°)V的有效值相量为。

A. 220/-40°V
B. 155.6/-40°V
C. 220/40°V
D. 155.6/40°V

正弦交流电流i=10sin(ωt+60°)A的最大值相量为。

A. 10/60°A
B. 7.07/-60°A
C. 14.14/60°A
D. 7.07/60°A