正常妊娠至分娩时羊水的量是
A. 2000-2500ml
B. 3000-4000ml
C. 250-500ml
D. 500-1000ml
E. 1000-1500ml
Task 1 Discuss the following questions after reading the passage.1. Why is Internet security becoming more and more important?2. What're the measures to ensure the security of online banking?
Task 1 Discuss the following questions after reading the passage.1. Do you often connect to Wi-Fi networks in the public?2. How many tips are being mentioned in the passage?
质权自( )时设立。
A. 质押协议成立时
B. 质押物交付时
C. 债权人和债务人约定的时间
D. 登记完成时