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【单选题】
显微镜中物镜的焦距是f 物 =0.3cm，目镜的焦距f 目 =2.5cm，为了看到尽可能大的清晰的像，物体离显微镜镜头的距离应（ ）A.
略小于0.3cm
B.
略大于0.3cm
C.
略小于2.5cm
D.
略大于2.5cm
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皮皮学刷刷变学霸
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【简答题】如图 所示, 不计滑轮重和摩擦 ,当分别用力匀速提起物体时,拉力 F 1 = F 2 ,则物体 C 与 D 的重力关系为 G C______ G D (选填“大于”、“等于”或“小于”)。 滑轮 ________ 可以看作省力杠杆(选填“ A ”或“ B ”)。 若两物体上升速度相同,则以物体 C 为参照物,物体 D 是 _________ 的(选填“运动”或“静止”)。
【单选题】According to the law of supply,
A.
producers are willing to supply larger amounts of a good as its price increases.
B.
the price of a good is directly related to the amount buyers choose to buy.
C.
the price of a good is inversely related to the amount buyers wish to buy.
D.
an inverse relationship between the price of a good and the amount producers supply.
【单选题】Which of the following demonstrates the law of supply?
A.
When leather became more expensive, belt producers decreased their supply of belts.
B.
When car production technology improved, car producers increased their supply of cars.
C.
When sweater producers expected sweater prices to rise in the near future, they decreased their current supply of sweaters.
D.
When lemon prices rose, lemon growers increased their quantity supplied of lemons.
【单选题】The law of supply implies that .
A.
there is a positive or direct relationship between price and quantity supplied
B.
the supply curve slopes upward
C.
as the price of the product increases, the quantity supplied increases
D.
all of these correctly state the law of supply
【单选题】病毒性肺炎和支原体肺炎的共同特点是()
A.
病变主要发生在肺间质
B.
易发生出血性肺炎
C.
肺泡表面易形成透明膜
D.
上皮细胞可融合成巨细胞
E.
以中性粒细胞浸润为主
【单选题】The law of supply states that, other things remaining the same,
A.
demand increases when supply increases.
B.
if the price of a good increases, firms buy less of it.
C.
if the price of a good increases, the quantity supplied increases.
D.
as peopleʹs income increase, the supply of goods increases.
E.
if the price of a good increases, the supply increases.
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