A:步骤①是对苹果进行灭菌处理
B:装瓶时发酵瓶要装满
C:产生的气体可用澄淸石灰水进行检测
D:整个过程始终保持无氧条件
6×8=____ 42÷7=____ 700+40=____ 50-40=____
38+27=____ 43+53=____ 6×9+9=____ 28÷7+58=____
A woman____ ____ by a self-driving car as she walked her bicycle across a street.
读“某国示意图”,回答下面小题。