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【判断题】
芹菜种子在高温下不易发芽,有弱光存在比黑暗下发芽率高。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】听取信息 Road accidents Road accidents happen every day and the reason why a lot of them happen is that people break the rules. In fact 50% of all fatal accidents occur because someone has 1.______. The m...
【单选题】Take care! Accidents _________ happen along this part of the road.
A.
will
B.
would
C.
must
D.
Shall
【简答题】消石灰沙浆广泛用于粘合砖石，细软的消石灰沙浆最后硬化而和砖、石结成一体．试回答： （1）消石灰沙浆表面会迅速硬化的主要原因是______（说明原因后，写出相应的化学方程式）． （2）硝石灰里的Ca（OH） 2 和细砂里的SiO 2 有无可能发生反应？说明理由（如认为可能发生反应的，则要写出相应的化学方程式）______．
【单选题】The number of traffic accidents that _______ in developing countries _______ increasing.
A.
happen; is
B.
happens; is
C.
happens; are
D.
happen; are
【简答题】Accidents happen almost every day. Some accidents are not serious and some are. We read about such accidents nearly every day in the newspapers. It is wrong for people to think that accidents take pla...
【简答题】生石灰可用于 和 的消毒
【简答题】消石灰沙浆广泛用于粘合砖石，细软的消石灰沙浆最后硬化而和砖、石结成一体．试回答： （1）消石灰沙浆表面会迅速硬化的主要原因是 _________ （说明原因后，写出相应的化学方程式）． （2）硝石灰里的Ca（OH） 2 和细砂里的SiO 2 有无可能发生反应？说明理由（如认为可能发生反应的，则要写出相应的化学方程式） _________________ ．
【单选题】Although accidents do happen, skiers will be reasonably safe if ______.
A.
they stay on the officially approved slopes
B.
they ski only for pleasure
C.
they ski only at resorts
D.
they choose less crowded ski slopes
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