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【简答题】
Dynamic water pressure
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皮皮学刷刷变学霸
举一反三
【单选题】According to the passage，the author of the article may agree to which of the following statements?
A.
It is appropriate to send your invitation cards three or four days before a dinner party date in U．S．A．
B.
It may be appropriate to send your invitation to your guests three or four days before a dinner party date in some cultures．
C.
It is best for one to make telephone calls at night because it costs much less．
D.
If one is less than 5 minutes late，he has to make a short apology．
【单选题】（ ）是指以合成树脂为主要原料，加入或不加入添加剂，在一定温度、压力下，经混炼、塑化、成型，且在常温下保持制品形状不变的材料。
A.
塑料
B.
木材
C.
玻璃
D.
槽钢
【单选题】()是指以合成树脂或天然树脂为主要原料，加入或不加入添加剂，在一定温度、压力下，经混合、冶炼、塑化、成型，且在常温下保持制品形状不变的材料。
A.
塑料;
B.
木材;
C.
玻璃;
D.
槽钢。
【单选题】According to the text, Neutrinos are kinds of particles that ______.
A.
are numerous and stable.
B.
have no electric charge.
C.
are short-lived matter.
D.
are small in amount.
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