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【单选题】
磁感线上任意点的 ( )方向,就是该点的磁场方向A.
指向 N极的
B.
切线
C.
直线
D.
指向 S极的
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举一反三
【单选题】Why are RDAs regularly updated?
A.
New discoveries in the science of nutrition are constantly being made.
B.
Americans' diets are constantly changing.
C.
As people age, their nutritional needs change.
D.
Very little is currently known about nutrition.
【单选题】Answer the questions about the words and expressions. If someone nags someone else, are they (a) encouraging them, or (b) criticizing them constantl
A.
T hey are encouraging them constantly.
B.
They are criticizing them constantly.
【单选题】It rained hard for several days. _____, a flood occurred in South China this summer. [ ]
A.
Constantly
B.
Firmly
C.
Consequently
D.
Deliberately
【单选题】A turbocharged diesel engine will have an intake manifold pressure____________.
A.
constantly decreasing as engine load increase
B.
constantly increasing as the amount of supercharging increases
C.
approximately equal to exhaust manifold pressure at all times
D.
approximately equal to atmospheric pressure at all times
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