单项选择题
使用60.0MHz的仪器，TMS吸收和化合物中某质子之间的频率差为180MHz。若使用40.0MHz的仪器，则它们之间的频率差是
A、120 MHz
B、100 MHz
C、160 MHz
D、180 MHz
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相关考题
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未知题型
A manufacture packages soap powder in containers of three different sizes. The amount of soap powder in a full large container could fill exactly 3 of the medium containers or exactly 5 of the small containers. If an equal number of small and large containers are to be filled with the amount of soap powder that would fill 90 medium containers, how many small containers will be filled?E.55
A.25
B.27
C.30
D.45 -
多项选择题
Thinking is a kind of cognitive activity, a rational stage of cognition, with abstraction, () and other characteristics.
A．Generality
B．Indirectness
C．Logical
D．acceleration -
单项选择题
变压器运行时，其绕组和铁芯产生的损耗转变成（ ）， —部分被变压器各部件吸收使之温度升高，另一部分则散发到周围介质中。 A. 热量 B. 有功 C. 无功 D. 动能
