A:are not decided
B:have not been decided
C:is not being decided
D:has not been decided
俄国日本均通过自上而下改革方式走上发展资本主义道路,根本因为俄、日两国( )
夏天,人们喜欢把啤酒放到冰箱里冰镇后再饮用,请问冰箱的插头为什么选用有三个脚的?人们在开启啤酒瓶盖的瞬间瓶口有一股“白烟”出现.请你用所学的物理知识解释此现象.
Can students ____ (eat) in the hallways?