【单选题】命题“如果a,b都是奇数,则ab必为奇数”的逆否命题是( )
【单选题】When asked why he is so successful in his life, Rong Yiren said honesty is the ___________ cause of his success. [ ]
【单选题】This passage talks mainly about ______.
A.
Why the umbrella was so popular in Europe
B.
When and how the umbrella was invented
C.
the history and use of umbrella
D.
the development of the umbrella
【单选题】As individuals, we are inherently more bruited than a community. Although we can consult books and friends and critics, in the end we are limited to our own single perspectives. We are only one person...
A.
are inevitably more narrow-minded and less resourceful
B.
are able to develop lasting friendship within a limited circle
C.
can focus on one history or one aspect of knowledge
D.
must decide whether or not to take advantage of the diversity
【单选题】传感器的测量结果相对于 PLC 是( )
【单选题】根据《汽车发动机缸体与气缸盖修理技术条件》(GB3801-83)的技术要求,气缸体上平面50X50(mm)测量范围内平面度误差应不大于()mm。
【单选题】在计算机的软硬件关系中,以下叙述正确的是( )。
D.
软件和硬件的界线不是绝对的,有时功能是等效的
【多选题】入境旅游团一行15人9日返程,8日导游员赵小姐安排其参观某真丝丝巾厂,参观后乘车返回饭店途中,旅游团成员李先生对地陪赵小姐说:“我刚才看中一条丝巾,但没拿定主意,现在决定购买。你能让司机送我们回去吗?”赵小姐欣然应许,并立即让司机驱车回丝巾厂。在丝巾厂,李先生发现喜欢的丝巾刚刚卖完,丝巾厂工作人员告知这种丝巾下星期就可有货,但是那时旅游团已经离开,李先生请赵小姐帮忙托运。 面对旅游者提出的多种多样...