万维网(WWW)信息服务是Internet上的—种最主要的服务形式，它进行工作的方式是基于 ______。

A．单机

B．浏览器/服务器

C．对称多处理机

D．客户机/服务器

The nurse plans to administer an injection of heparin to a client. Which of the following techniques for heparin administration is appropriate()

A. Selects a 1.5-inch, 21-gauge needle for the injection.

B. Makes the injection into the deltoid muscle.

C. Applies gentle pressure to the site for 5 to 10 seconds after the injection.

D. Aspirates with the plunger to check for entry into the blood vessel before injecting the heparin.