下述物质中不引起支气管哮喘发病的炎性介质是（） A.前列腺素 B.心钠素 C.白三烯

题11-14 某多层地下建筑采用泥浆护壁成孔的钻孔灌注桩基础，柱下设三桩等边承台，钻孔灌注桩直径为800mm，其混凝土强度等级为C30(f _c =14.3N/mm²，γ=25kN/m³)。工程场地的地下水设防水位为-1.0m；有关地基各土层分布情况、土的参数、承台尺寸及桩身配筋等，详见图1-12。

假定按荷载效应标准组合计算的单根基桩抗拔力N_k为1200kN；土层及岩层的抗拔系数λ均取0.75。试问，按《建筑桩基技术规范》(JGJ94—2008)的规定，当群桩呈非整体破坏时，满足基桩抗拔承载力要求的基桩最小嵌固入岩深度l(m)，与下列何项数值最为接近

A．(A) 1.90

B．(B) 2.30

C．(C) 2.70

D．(D) 3.10

短文填空。

Dear editor,

     I am Evan from Canada. Being the eldest child in the family has its disadvantages. First of all, I have to

share all my (1)______ (玩具) with my younger sisters. Of course, they don't (2)n______ to return the favor

because I'm totally uninterested in their things. (3)______ (除……之外) that, they are always hanging around

me. I just can't get a moment's (4)p______. At meals, I have to eat whatever is (5)______ the plate regardless

of the taste. My sisters only try one bite if it's not (6)______ favorite food. In addition, (7)w______ it comes

to practicing our musical instruments. I have to practice (8)______ than double the time. Worst of all, I get a

larger quantity of homework, (9)______ (对比) to them. I'm feeling rather annoyed. Can you please

(10)g______ me some advice? 

Yours truly

Evan Smith                                                                             

充油变压器、互感器应在油静止（）h进行耐压试验。

A.10

B.15

C.20

D.25

杂质半导体中（）的浓度对温度敏感。

A.少子

B.多子

C.杂质离子

D.空穴

假设机长的所有无线电VHF工作正常，副驾驶的VHF—1也工作正常，但是当你VHF—2发射信号的时候却听不到声音，那么，你判断是哪个系统LRU出现故障（）

A.机长控制面板

B.2#无线电控制面板

C.遥控电子组件

D.VHF—2收发机