| What produces a waterproof super glue,
acts like a vacuum cleaner, and even teaches scientists about gene repair The
humble little shellfish known as the mussel (贻贝)。 Mussels are found worldwide. Some live in the sea. Others inhabit freshwater streams and lakes. When you try to move a mussel from a rock, you will discover what an incredibly firm grip it has- a necessity if the mussel is to resist the sharp grab of a hungry seabird or the pounding waves of the sea. How does it manage to cling so tight When it choose a place to set up home, it pokes its tongue-shaped foot out of its shell and presses it against a solid surface. Special glands give off a fluid mixture of proteins into a channel that runs the length of the foot. The liquid quickly hardens into a fine, elastic thread about an inch long. Then a tiny pad-like structur A. mussels can be used to produce super glue B. mussels have an amazing power useful to man C. it is important to protect mussels D. mussels are much smarter than we think [单选题]《茶叶卫生标准》规定茶叶中氟氯氰菊酯的含量不能超过()。
A.0.2mg/kg B.1mg/kg C.10mg/kg D.20mg/kg [填空题]C类网段192.168.1.0/24,有( )个可用主机地址。
[判断题]在带电接触网下进行事故应急救援、抢险处理时，在供电部门未采取安全可靠的防护措施前,任何单位或个人不得擅自组织处理。( )
A.正确 B.错误 [单选题]钢轨探伤仪后37°探头能发现( )象限螺孔斜裂纹。
A.II、Ⅳ B.I、II C.II、IⅡ D.I、III [判断题]根据《铁路交通事故调查处理规则》规定，事故报告后，人员伤亡、脱轨辆数、设备损坏等情况发生变化时，应及时补报。
A.正确 B.错误 [单项选择]下列各项，可以成为建筑工程第三者责任险的保险标的的是（）。（2005年）
A. 被保险人的民事侵权赔偿责任 B. 被保险人的道义责任 C. 被保险人的行政责任 D. 被保险人的刑事责任 我来回答: 提交
|
