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【单选题】
蜂蜜含多种糖类、氨基酸（蛋白质片段）以及丰富的维生素、矿物质等。下列说法科学的是A.
糖类物质和蛋白类的组成元素都含有C、H、O、N
B.
人体可以合成各种氨基酸，进而构建为蛋白质
C.
蜂蜜中含有人体必需的微量元素钾、钙、钠、镁、锰、铁、铜
D.
维生素C通常还广泛存在于有花菜、青辣椒、橙子、葡萄汁等蔬菜、水果中
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反馈参考答案：
举一反三
【单选题】Multiple selection problem (one option) For the circuit, if the frequency of the excitation is f=100Hz, it is( ); if the frequency of the excitation is f=200Hz.
A.
resistive, inductive
B.
capactive, inductive
C.
capactive, resistive
【多选题】When two tuning forks are sounded at the same time, a beat frequency of 5 Hz occurs. If one of the tuning forks has a frequency of 245 Hz,the frequency of the other tuning fork is .
A.
260 Hz
B.
250 Hz
C.
240 Hz
D.
235 Hz
【单选题】When paralleling two AC generators, the frequency of the machine coming on-line, immediately prior to closing its breaker, should be _____.
A.
slightly less than the oncoming generator frequency
B.
the same as the bus frequency
C.
slightly greater than the bus frequency
D.
the same as the bus voltage
【单选题】Suppose that in a population the frequency of a particular recessive condition is 1/400. Assume the presence of only a dominant allele (A) and a recessive allele (a) in the population and that the pop...
A.
0.000625
B.
0.0025
C.
0.025
D.
0.05
E.
0.95
【简答题】In FM the frequency of the carrier wave is varied within a fixed range at a rate corresponding to the frequency of a sound signal.
【简答题】对两个事物或现象进行阴阳属性划分，是有一定原则的。这是下列哪项的内涵?() A阴阳的相关性 B阴阳属性的规定性 C阴阳的相对性 D阴阳的可分性
【单选题】As a result, the system will vibrate at the frequency of the _____ force regardless of the initial conditions or natural frequency of the system.
A.
action
B.
excitation
C.
out
D.
act
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