路基石方爆破开挖时，选择清方机械主要考虑的因素有（）。 A.场内道路条件 B.进场退

大道的“十字”路口上，安装着交通指示灯，每组指示灯是“红、黄、绿”三盏，每盏灯上都标有“220V　100W”字样，则每组灯正常工作时每小时耗电（   ）

A．0. 1度　

B．0.2度　

C．0.3度　

D．0.4度

常把大于等于（）个以上的支路的连接点称为接点。

A、1

B、2

C、3

D、4

垂体性侏儒的最好治疗方法是

A．人生长激素替代疗法

B．促蛋白合成激素应用

C．绒毛膜促性腺激素

D．甲状腺片

E．糖皮质激素

下列方法中，可以直接检测桩身混凝土强度的有( )。

A．低应变动测法
B．高应变动测法
C．钻芯法
D．声波透射法

Most people have no idea of the hard work and worry that gointothe collecting of those fascinating birds and animals that they pay to see in the zoo.One of the questions that is always asked of me is 1 I became an animal collector in the first 2.The answer is that I have always been interested in animals and zoos.According to my parents, the first word I was able to say with any 3 was not the conventional “mamma” or “daddy”,4 the word “zoo”, which I would 5 over and over again with a shrill 6 until someone, ingroupsto 7 me up, would take me to the zoo.When I 8 a little older, we lived in Greece and I had a great 9 of pets, ranging from owls to seahorses, and I spent all my spare time 10 the countryside in search of fresh specimens to 11 to my collection of pets.12 on I went for a year to the City Zoo, as a student 13 , to get experience of the large animals, such as lions, bears, bison and ostriches,14 were not easy to keep at home.When I left, I 15 had enough money of my own to be able to 16 my first trip and I have been going 17 ever since then.Though a collector's job is not an easy one and is full of 18 ,it is certainly a job which will appeal 19 all those who love animals and 20.

请在1处填上正确答案（）

A.how

B.where

C.when

D.whether