正常成人颅腔容积为()。
A.600~800ml
B.1100~1200ml
C.1400~1500ml
D.1700~1800ml
E.2000~21OOml
参考答案:C
The course normally attracts 20 students per year, ___________ up to half will be from abroad.
A.in which
B.for whom
C.with which
D.of whom
如图所示,线圈内有理想边界的磁场,当磁感应强度均匀增加时,有一带电粒子静止于水平放置的平行板电容器中间,则此粒子电性是______,若增大磁感应强度的变化率,则带电粒子将______(填“向上运动”“向下运动”或静止”)