一般水痘皮疹经 _________ 、 _________ 、 _________ 、 _________ 各阶段。
参考答案:斑疹丘疹疱疹结痂
He to school by bike, but now he to school on foot.
A.used to going; gets used to go
B.used to go; gets used to go
C.used to go; gets used to going
WT-50地震钻机使用的动力元件是()
A、叶片式泵
B、齿轮式油泵
C、柱塞式油泵
D、螺杆式油泵