【单选题】We _____ in the city, but now we live in the countryside
【单选题】When the author says that we need to be in the driver's seat, he means that .
A.
a. we need to drive a car
B.
b. we should control our driving
C.
c. we must change the world
D.
d. we should govern our thinking
【单选题】_________ for over 50 years, we are confident we can give our customers complete satisfaction.
B.
Having been in business
【判断题】“数学上的点”可以分割,没有广延是莱布尼茨的观点。()
【单选题】下列说法正确的是( )
A.
将某电解质溶液加水稀释,溶液中离子浓度都减小
B.
将AlCl 3 溶液、Na 2 SO 3 溶液蒸干并灼烧分别得到Al 2 O 3 、Na 2 SO 3
C.
0.1mol/LCH 3 COOH溶液在稀释过程中c(H + )/c(CH 3 COOH)将变大
D.
25℃时,pH=3的某酸溶液与pH=11的NaOH溶液等体积混合后,溶液的pH≥7
【判断题】交流异步电机的转子与定子旋转磁场以不同的方向、不同的速度旋转,存在转差率。 ( )