[单选题]We can conclude from this passage that avalanches________

回答下面的题目Never laugh at a snow covered mountain! Laughter and yelling, during the avalanche season, can cause a deadly pile of snow．Huge snow slides are most common in mountains where there are steep slopes that are well buried in snow and ice．The snow builds up slowly and lands very softly．This can create a very touchy, unstable situation．Tons of snow may be held up by only the friction between snowflakes．The deep snow is like a house of cards．The slightest movement can cause it to fall．As soon as something slips, this great mass of snow will come crashing down the mountainside．Slides may be started by sound vibrations．They may also be started by the weight of wet, melting snow．Once an avalanche has been triggered, the cause no longer matters．Moving down a steep slope, it picks up great speed and added snow．Some avalanches travel as fast as two hundred miles per hour．The force of an avalanche will mow down anything in its path．Whole houses have been swallowed up by these fast-paced piles of snow．The wind that is caused by an avalanche is almost as destructive as the snow itself．Winds from an avalanche have been known to travel as fast as those of a tornado．So, when approaching a thickly snow covered mountain, speak softly!Avalanches can be started by________

正确答案 ：C

have killed people

解析：选项A和B在文中并未提及。文中提到雪崩的强大力量，可以毁掉整座房子，人肯定也是有伤亡的。选项C是正确的。

[单选题]啤酒花的叶（）、纸质，卵形或掌形，3～5裂，边缘具粗锯齿。

正确答案 ：C

C、对生

[单选题]混支柱翼缘破损局部露筋（）可修补使用。

正确答案 ：A

（A）1-2根

[单选题]当检修门下落，要提工作门时，必须先开（），以排水。

正确答案 ：D

D、旁通阀

[多选题]因债权人的原因，债务人难以履行债务的，可以将标的物提存。在提存期间，下列说法正确的有（）。

正确答案 ：ABCD

标的物毁损、灭失的风险由债权人承担

标的物的孳息归债权人所有

标的物的提存费用由债权人负担

债务人仍负有后合同义务

解析：本题考核与提存有关的规定。

[单选题]小儿烧伤的特点不包括（）

正确答案 ：A

单位体表面积血容量大，不易发生休克

[单选题]下列现象中（）是发现溢流的一个可靠信号。

正确答案 ：A

A、钻井液池液面升高

[单选题]下列哪项不属于PTP端口工作方式选择：（）

正确答案 ：C

C、自动选择方式；

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