【单选题】公式A=(∃x)(P(x)→Q(x))的解释为:个体域D={2} ,P(x) :x>3, Q(x) :x==4 , 则 A 的真值为( )。
【判断题】利用辅助平面法求曲面体的相贯线,要求辅助平面与曲面体截交形成直线或圆,截交线的交点即为相贯线上的点。
【单选题】为确保工程质量,对环境温度高于50°C处的变形缝止水带,要采用整条的:
【简答题】Stereotypes are _______________ of a person, which is created without taking the whole person into account.
【判断题】平面立体与曲面立体相交,其相贯线的求法可归结为求平面立体的各表面与曲面立体的截交线。( )
【简答题】实验一:称量9.5g MgCl 2 溶于水配成100mL溶液; 实验二:取“实验一”配得的Mg Cl 2 溶液25.0mL,稀释到500mL. (1)“实验一”所得MgCl 2 溶液的物质的量浓度为______,“实验二”所得Mg Cl 2 溶液中Cl - 的物质的量浓度为______. (2)以上两个实验中除了用烧杯、量筒、胶头滴管外,还需要用到的玻璃仪器为______. (3)配制“实验一”的...
【单选题】Which is NOT the possible function of keeping pet?
A.
Lowering a person's blood pressure.
B.
Preparing a young couple for the responsibilities of parenthood.
C.
Encouraging social relationships.
D.
Indicating the owner's social status and wealth.
【单选题】A person (P) is necessarily related to a reporting entity (R) if:
A.
P owns ordinary shares in R
B.
P's grandfather has control over R
D.
P is the domestic partner of a director of R