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【多选题】
当系统频率降低较大时，对系统运行极为不利，甚至会造成系统崩溃的严重后果：（）A.
对汽轮机产生影响，频率降低会导致汽轮机的叶片产生裂纹，甚至叶片断裂
B.
发生频率崩溃现象
C.
发生电压崩溃现象
D.
电力系统发生低频振荡
E.
发电机励磁自动控制系统失磁
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【单选题】女性,36 岁,阴道黏膜不慎损伤感染,护士在配制伤口冲洗液需将5%新洁尔灭10ml 加蒸馏水至 A.1250ml
A.
1000ml
B.
750ml
C.
500ml
D.
250ml
【单选题】Why do cars need to travel slowly along some suburban roads in the US?
A.
Because children brought up in the suburbs are not accustomed to walking in busy streets.
B.
Because there are no traffic lights in streets in the suburbs.
C.
Because some suburban roads are so bad.
D.
Because some suburban roads are very narrow.
【简答题】聪明宝贝动动脑。哪些动物有这些特征呢？把它画出来吧！ 1 2 3 4 5 fur mane stripes pouch trunk
【单选题】听力原文： These are some of the signs that you see on the roads of Great Britain. Number one is a sign with the number thirty on it. When drivers see this sign they must not go at more than thirty miles a...
A.
Seven.
B.
Eight.
C.
Nine.
D.
Ten.
【单选题】These are some of the signs that you see on the roads of Great Britain. Number one is a sign with the number thirty on it. When drivers see this sign they must net go at more than thirty miles an hour...
A.
People who drive badly.
B.
People who are learning to drive.
C.
People who drive well.
D.
People who drive carelessly.
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