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【单选题】
设X线管的阳极倾角为θ,下列公式正确的是:A.
标称焦点=实际焦点 X cosθ
B.
B．标称焦点=实际焦点 X sinθ
C.
实际焦点=标称焦点 X sinθ
D.
D．实际焦点=标称焦点 X cosθ
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举一反三
【单选题】The reason why the rock was hard to get down was that ______.
A.
it had been worn smooth
B.
there was no grass on it
C.
it, was wet and slippery
D.
it was soft and sandy
【单选题】The reason ______ most Chinese have healthy white teeth is ______ they eat a healthy diet.
A.
why; that
B.
why; because
C.
that; that
D.
for; that
【单选题】The major reason why Americans enjoy an abundant food supply is that the arable land at their disposal for food production is ______.
A.
three times more the world average
B.
three times as much the world average
C.
three times the world average
D.
the world average is three times
【单选题】The reason ________ he was late for the meeting is ________ his car broke down on the road.
A.
why; that
B.
why; because
C.
that; that
D.
for which; because
【单选题】The reason ____he was late was ____he had taken a wrong bus.
A.
why; because
B.
for; because of
C.
why; that
D.
for; that
【判断题】《旅游法》第9条规定，旅游者有权自主选择旅游产品和服务，有权拒绝旅游经营者的强制交易行为。旅游者有权知悉其购买的旅游产品和服务的真实情况。旅游者有权要求旅游经营者按照约定提供产品和服务。
A.
正确
B.
错误
【单选题】下列选项, 不属于 宋代诉讼法制变化的是:
A.
为不妨碍农务经营，对提起诉讼时间加以限制，规定在农忙之时不得提起民事诉讼（刑事诉讼不受影响），是为“务限法”
B.
当犯人称冤，或家属代为申诉时，由原审机关的其他推官复审，称为：“移推”
C.
当犯人称冤，或家属代为申诉时，由上级官府派员或指定其他官府复审，称为“移司别推”
D.
强窃盗犯服刑完毕后，发付原籍充“警迹人”
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