单项选择题
A.very soft mud B.rocky C.a mixture of mud and clay D.loose sand
As a last resort，a tourniquet can be used to（）.A.hold a...
单项选择题As a last resort，a tourniquet can be used to（）.
A.hold a victim in a stretcher B.stop uncontrolled bleeding C.hold a large bandage in place D.restrain a delirious victim
An uncontrolled flow of gas，oil，or other well fluids in...
单项选择题An uncontrolled flow of gas，oil，or other well fluids into the atmosphere is called a（）.
A.flow B.breakout C.kick D.blowout
All the traces are（）old ones.A.clearB.evidentC.obviousD...
单项选择题All the traces are（）old ones.
A.clear B.evident C.obvious D.apparently
