下列软件中，属于系统软件的是______。A．C++编译程序 B．Excel 200

销售代表进行客户引导、咨询、查询、演示、推介、产品或终端销售、客户挽留等工作，并保持最佳销售效率

若a，b互为相反数，c是最小的非负数，d是最小的正整数，则（a+b）d+d-c=______．

关于气囊止血带的使用，不恰当的方法为()

A．每次放松5～10分钟

B．连续使用时间最多不超过2小时

C．连续使用时间为60分钟

D．绑扎下肢充气压力为80kPa(600mmHg)

E．绑扎上肢充气压力为40kPa(300mmHg)

如图所示，光滑圆弧斜槽固定在台面上，一质量为m的小滑块，从斜槽上端比台面高H处由静止下滑，又滑到在台面旁固定的木块上，在木块上表面滑过s后，停在木块上，木块长为L，质量为M，求：

（1）小滑块滑到斜槽底端时的速度。

（2）小滑块与木块的动摩擦因数。

（3）若木块不固定，能沿光滑水平面运动，欲使小滑块在木块上恰滑到b端，且不掉下，小滑块应从距台面多高处由静止开始滑下。

Millions of Americans and foreigners see GI.Joe as a mindless war toy, the symbol of American military adventurism, but that’ s not how it used to be. To the men and women who (1) in World War I1 and the people they liberated, the GI. was the (2) man grown into hero, the pool farm kid torn away from his home, the guy who (3) all the burdens of battle, who slept in cold foxholes, who went without the (4) of 1hod and shelter, who stuck it out and drove back the Nazi reign of murder. This was not a vohmteer soldier, not someone well paid, (5) an average guy, up (6) the best trained, best equipped, fiercest, most brutal enemies seen in centuries.

His name is not much. GI. is just a military abbreviation (7) Govermnent Issue, and it was on all of the article (8) to soldiers. And Joe A common name for a guy who never (9) it to the top. Joe Blow, Joe Magrae... a working class name.The United States has (10) had a president or vieepresident or secretary of state Joe.

GI. Joe had a (11) career fighting Geman, Japanese, and Korean troops. He appears as a character, or a (12) of American personalities, in the 1945 movie The Story of GL Joe, based on the last days of war correspondent Ernie Pyle. Some of the soldiers Pyle (13) portrayde themselves in the fihn. Pyle was famous for covering the (14) side of the warl, writing about the dirt-snow-and-mud soldiers, not how many miles were (15) or what towns were captured or liberated. His reports (16) the "willie" cartoons of famed Stars and Stripes artist Bill Maulden. Both men (17) the dirt and exhaustion of war, the (18) of civilization that the soldiers shared with each other and the civilians: coffee, tobacco, whiskey, shelter, sleep. (19) Egypt, France, and a dozen more countries, G. I. Joe was any American soldier, (20) the most important person in their lives.

5（）

A.and

B.nor

C.but

D.hence