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【单选题】
下列关于离心机使用错误的是A.
离心机使用之前，离心管配平，并放在离心机对称的位置上。
B.
离心机使用时，设置的转子必须与控制面板上一致。
C.
离心机停止之前，可以打开门盖。
D.
离心机使用时，不能超过最大转速使用。
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】婴儿辅食添加首选富含（ ）的泥糊状食物
【单选题】What made the speaker change his life style?
A.
His desire to start Iris own business.
B.
The crisis in his family life.
C.
The decline in his health.
D.
His dream of living in the countryside.
【简答题】He made cheese and butter for the family with what (leave).
【单选题】passage2: what made the speaker change his life style?
A.
his desire to start his own business
B.
the crisis in his family life
C.
the decline in his health
D.
his dream of living in the countryside
【单选题】下列关于救生艇的检查保养要求哪些是正确的________。Ⅰ．每月检查一次救生艇内的属具；Ⅱ．每月更换一次淡水，注意防冻；Ⅲ．救生口粮按其保质期及时更换；Ⅳ．机动救生艇每周试车一次。
A.
Ⅰ～Ⅳ
B.
Ⅱ～Ⅳ
C.
Ⅰ～Ⅲ
D.
Ⅰ、Ⅱ、Ⅳ
【简答题】HDfS 中的 block 默认保存几份?() A3份 B2份 C1份 D不确定
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