— Excuse me, could you tell me ?— Certainly. In half an hour.
A:when the high speed train would arrive
B:when the high speed train will arrive
C:when would the high speed train arrive
D:when will the high speed train arrive
在生产和生活中,人们常把密度作为所选材料的主要考虑因素,下面属于主要从密度的角度考虑选材的是( )
①七七事变 ②九一八事变 ③西安事变 ④中共七大
下列说法正确的是 ( )
在光学显微镜下,可以看到细胞内有绿色颗粒。它们是____,与植物的____ 作用有关。