常用的人造木板材有：（）。A、细木工板； B、胶合板； C、纤维板； D、刨花

病历摘要：患者女性，50岁。30分钟前从摩托车上摔下，左枕部着地，当时人事不醒，双侧瞳孔等圆等大，直径约2.5mm，呕吐3次，为胃内容物，量多，非喷射状。约30分钟后，患者清醒，诉头痛，恶心，四肢活动好，继续上路；约3分钟，患者又人事不醒。体查：T36.8℃，P60次/分，R15次/分，BP22/11Kpa。右侧瞳孔5mm，左侧瞳孔2.5mm，对刺痛能睁眼，呻呤，对语言不能应答，左侧肢体运动反应只能肢体过伸。

针对该病人，气管切开术的目的是：提示：术后第3天，病人神志转差，各种反射下降。按医嘱行“气管切开术”。（）

A.解除喉梗阻

B.吸除下呼吸道分泌物

C.对呼吸停止者施行正压人工呼吸

D.避免误吸

E.降低呼吸阻力

F.减少体力消耗

有关物质水解产物的叙述中不正确的是（　　）

A．纤维素水解与淀粉水解得到的最终产物不同

B．油脂水解可得到丙三醇（甘油）

C．蛋白质水解的最终产物均为氨基酸

D．可用碘水检验淀粉水解是否完全

飞行时间质谱仪可以对气体分子进行分析．如图所示，在真空状态下，脉冲阀P喷出微量气体，经激光照射产生不同价位的正离子，自a板小孔进入a、b间的加速电场，从b板小孔射出，沿中线方向进入M、N板间的偏转控制区，到达探测器．已知元电荷电量为e，a、b板间距为d，极板M、N的长度和间距均为L．不计离子重力及进入a板时的初速度．

（1）当a、b间的电压为U₁时，在M、N间加上适当的电压U₂，使离子到达探测器．请导出离子的全部飞行时间与比荷K（K=

（2）去掉偏转电压U₂，在M、N间区域加上垂直于纸面的匀强磁场，磁感应强度为B，若进入a、b间的所有离子质量均为m，要使所有的离子均通过控制区从右侧飞出，a、b间的加速电压U₁至少为多少？

"In the long run," as John Maynard Keynes observed, "we are all dead. " True. But can the (1) run be elongated in a way that makes the long run (2) And if so, how, and at what cost People have dreamt of (3) since time immemorial. They have sought it since the first alchemist put an elixir of (4) on the same shopping list as a way to turn lead into gold. They have (5) about it in fiction, from Rider Haggard’s "She" to Frank Herbert’s "Dune". And now, with the growth of (6) knowledge that has marked the past few decades, a few researchers believe it might be within (7) .

To think about the question, it is important to understand why organisms-people (8) -age in the first place. People are like machines: they (9) That much is obvious. However, a machine can always be (10) A good mechanic with a stock of spare parts can keep it going (11) . Eventually, no part of the (12) may remain, but it still carries on, like Lincoln’s famous axe that had three new handles and two new blade.

The question, of course, is whether the machine is worth (13) . It is here that people and nature (14) . Or, to put it slightly (15) , two bits of nature disagree with each other. From the individual’s point of view, (16) is an imperative. You cannot reproduce unless you are alive. A fear of death is a sensible evolved response and, since (17) is a sure way of dying, it is no surprise that people want to stop it in its tracks. Moreover, even the appearance of ageing can be (18) . It (19) the range of potential sexual partners who find you attractive-since it is a sign that you are not going to be (20) all that long to help bring up baby-and thus, again, curbs your reproduction.

13（）

A.replacing

B.repairing

C.buying

D.upgrading

弥补亏损额度初始信息如何产生？