关于平衡力，下面的说法正确的是（ ） A．如果一个物体做直线运动，则它一定受平衡

四（1）班有男生a人，女生比男生少3人，女生有______人，全班共有学生______人．

分动器的操纵机构必须保证：非先挂低速挡，而不得接前桥；非先接前桥而不得摘低速挡。

建国初期，中 * * 党在土地改革中对富农的政策是征收富农多余的土地财产。

After a gastrectomy, the client will have a nasogastric tube in place for several days postoperatively. The nurse explains to the client that the nasogastric tube is for which of the following reasons

A. Prevent excessive pressure on suture lines.
B. Prevent the development of ascites.
C. Provide enteral feedings in the immediate postoperative period.
D. Enable administration of antacids to promote healing of the anastomosis.

全人棉无弹针织汗布，若不作任何特殊处理，缩水率会达到（）

A.5-7%

B.7-8%

C.9-10%

D.10%以上