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【多选题】
瓦斯爆炸的引起原因包括：A.
瓦斯积聚
B.
CO 浓度达到 0.0024% 以上
C.
引爆火源
D.
管理 不善
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
【单选题】Features such as height, weight, and skin color ________ from individual to individual and from face to face.
A.
change
B.
vary
C.
alter
D.
convert
【简答题】听录音,补全段落 I'm gald to have a ___1_____ to take part in the _____2___ exhibition. There're so many ____3____ looking at the different models in different boothes. A couple wanted to see the ____4____ mo...
【单选题】下列哪项对老年噎呛者健康指导是错误的
A.
不必处理，等待医务人员抢救
B.
当患者发生呛咳时，立即协助低头弯腰，身体前倾，下颏朝向前胸
C.
如果食物残渣堵在咽喉部危及呼吸时，应低头弯腰，喂食者可在肩胛下沿快速连续拍击，使残渣排出
D.
在第一时间尽可能自行去除堵塞气道的异物的同时，应尽早呼叫医务人员抢救
【单选题】Stone Hill Mall Stone Hill Mall has fewer large department stores than most malls but, instead, features more than 100 small specialty shops, while the few that are not used yet will be filled as soon...
A.
more large department stores.
B.
more empty space to rent.
C.
many shops selling special goods.
D.
shops selling expensive goods.
【单选题】Stone Hill Mall has fewer large department stores than most malls, but, instead, features more than 100 small specialty shops, while the few that are not used yet will be filled as soon as the mall's ...
A.
more large department stores
B.
more empty space to rent
C.
many shops selling special goods
D.
shops selling expensive goods
【简答题】什么是生长曲线?分几个阶段?说明该曲线每一阶段的特点。
【单选题】如图两个大小不同的容器用均匀的细管相连, 管中有一水银滴作活塞,大容器装着氧气,小容器装着氢气,当温度相同时,水银滴正好在细管中央,则此时这两种气体中
A.
氢气的密度较大
B.
氧气的密度较大
C.
密度一样大
D.
密度大小无法判定
【单选题】How are you getting on today? -- _________
A.
Very well.
B.
How do you do?
C.
I'm a doctor.
D.
Nice to have known you.
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