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【判断题】
具有多余约束的几何不变体系,不一定都是定结构。( )A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】使用温度计时，下列说法正确的是（ ）
A.
体温计不能用来测量开水的温度，但是可以用来测量冰的温度
B.
测一杯热水的温度时，可以把温度计从水中拿出来靠近眼睛，这样读数更准确
C.
在使用温度计前，要用力往下甩
D.
使用温度计时，要让温度计的玻璃泡跟被测物体充分接触
【简答题】完形填空：通读短文，掌握大意,然后从所给的4个选项中选出一个最佳答案。 Johnny Sylvester, eleven years old, was in bed in the hospital. A few days ago, when he was 1 in a football , he fell and his head hit the ground. The doctors t...
【简答题】完形填空。 Johnny Sylvester, eleven years old, was in bed in the hospital. A few days ago, when he was 1 in a football , he fell and his head hit the ground. The doctors thought he might never get well...
【简答题】用 可以准确测量水的温度。
【简答题】完型填空。 John,11 years old, was in bed in hospital. Several days before, while he was 1 in a baseball , he fell and hit his head. The doctors believed that he might 2 get well. 'He seems to have give...
【简答题】完形填空。 Johnny Sylvester, eleven years old, was in hospital. Several days before, 1 he was playing in a football , he 2 and his head hit the ground. The doctors believed that he might never get well...
【单选题】以下属于相对安全观的是( )
A.
无危则安,无损则全
B.
安全指没有危险、不受威胁、不出事故
C.
安全意味着可以容许的风险程度,比较地无受损害之忧和损害概率低
D.
所谓安全系指判明的危险性超过允许限度
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