什么叫孔口装置？
参考答案：
在施工上仰孔、水平孔或瓦斯抽放孔时，为了不使钻孔内返出的冲洗液影响正常钻进和安全的需要，在孔口设置的装置，叫孔口装置。
单句改错（每题1分，共5分）
66. The old woman is still dressing the ring her husband gave her 40 years ago. _________________
67. It is so cold outside. I would rather to stay at home. _________________
68. According to the local custom, when a child is born, the parents will give off red eggs to their friends and neighbors. __________________
69. Business and commercial activities become less hot during the week followed Christmas. _____________________
70. This flood has brought 6 deaths up to now, and there are many more injured. ____________________
属于原发性肺结核的是
A．局灶性肺结核B．慢性空洞性肺结核C．肺门淋巴结结核D．原发综合征E．结核瘤
