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【判断题】
通过与他人交流可以有效减少实验中的错误。()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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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】Long ago people send messages in different ways. A man put his ear to the ground. He 1 the horses. They were coming this way. He ran to 2 his people. He was a 3 .That was one way to send messages. Peo...
【单选题】He __________ the keys from my hand and ran away.
A.
caught
B.
brought
C.
pulled
D.
snatched
【简答题】句型转换。 1. He ran in the school for half an hour (对画线部分提问) _______ _______ _______ he run in the school ? 2. We started to skate two hours ago . (对画线部分提问) _______ _______ you start to skate? 3. They sta...
【单选题】用紫外线消毒物品表面,其有效距离与时间要求是
A.
60cm，不少于20分钟
B.
1m，不少于30分钟
C.
1m，不少于45分钟
D.
3m，不少于30分钟
E.
3m，不少于45分钟
【简答题】Long long ago, people sent messages in different ways. A man put his ears to the ground. He 1 the horses. They were coming this way. He ran to 2 people.He was a 3 .That was one way to send messages. P...
【单选题】下列说法正确的是
A.
荧光量子产率的数值总是大于1
B.
荧光分光光度计中有一个单色器，用于选择激发波长，置于样品池前
C.
原子荧光分光光度计主要由发射光源、原子化器、分光系统、检测系统、数据处理系统五个部分组成
D.
溶剂的极性增加，会使物质的荧光强度增强，且荧光波长向长波方向移动。
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