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【简答题】
已知下列命题为假,写出其余三个命题,并根据对当关系指出它们的真假(写在纸上,拍照上传): 价格昂贵的商品都是质量好的商品。 有的金属是绝缘体。 所有的蛇都不是有毒的。 有的哺乳动物不是脊椎动物。 所有的质数都是奇数。 所有价格高的商品都是质地优良的商品。 没有生产资料是商品。 这个铁笼里的蛇有的是无毒的。 北京市的公民人人都有自行车。 这辆公共汽车的乘客并非都是大学生。
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Ben derived a lot of ______ from his boss’s apology. A. comfort B. ease C. gratification D.
A.
comfort
B.
ease
C.
gratification
D.
satisfaction
【单选题】The students were ______ by his humorous words.
A.
carried away
B.
carried in
C.
carried out
D.
carried on
【单选题】We _____ his luggage; his brother carried it himself.
A.
needn’t have carried
B.
didn’t need carrying
C.
needed to have carried
D.
didn’t need to carry
【单选题】控制系统引入积分作用是为了消除余差,但积分的引入会使系统产生振荡现象。而引入微分作用是为了克服( )对系统的影响。
A.
纯滞后
B.
容量滞后
C.
传输滞后
D.
时滞
【单选题】What is true of the past definitions of happiness?
A.
They were based on self-gratification.
B.
They varied greatly.
C.
They were based on lifestyles.
【单选题】We his luggage; his brother carried it himself.
A.
needn’t have carried
B.
didn’t need carrying
C.
needed to have carried
D.
didn’t need to carry
【多选题】石决明中杂色鲍的性状特征是
A.
长卵圆形，内面观略呈耳形
B.
表面有多数螺肋和细密生长线
C.
螺旋部小，体螺部大
D.
内面具珍珠样彩色光泽
E.
末端4～5个开孔，孔口突出壳面
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