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【多选题】
具有压电效应的材料为压电材料，常见的压电材料包括（）。A.
压电单晶体
B.
多晶压电陶瓷
C.
复感式
D.
高分子压电材料
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【简答题】Which of the following situations is IMPOSSIBLE? A. New charge items may be introduced by operators. B. The plan will be incentive to investment and competition. C. The plan will make people who don’t...
【单选题】The President ________ his intention to retire before the next election. [ ]
A.
announced
B.
told
C.
informed
D.
promised
【单选题】Before he left the White House, the president made a _______ speech.
A.
quarrel
B.
symbol
C.
automobile
D.
farewell
【单选题】Before he left the White House, the president made a ____speech.
A.
quarrel
B.
symbol
C.
automobile
D.
farewell
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