一节干电池的电压是_______V，合______mV，家用电器正常工作的电压是_______V。
1.5；1500；220
低血量性休克、创伤性休克和感染性休克是外科最常见的休克。
_______ cars when you cross the busy street. Which of the following is not OK? [ ]
A. Watch out for
B. Look out for
C. Watch over
D. Be careful of
