规格8.48*0.185*29*23*60*4*R的内螺纹芯头,23代表什么含义:()
A.芯头齿顶角23°
B.芯头螺旋角23°
C.生产铜管齿顶角23°
D.生产铜管螺旋角23°
A.芯头齿顶角23°
B.芯头螺旋角23°
C.生产铜管齿顶角23°
D.生产铜管螺旋角23°
A.芯头实际外径8.48mm
B.芯头名义外径8.48mm
C.管坯内径8.48mm
D.铜管外径8.48mm
【26】, inaccurate or indefinite words may make【27】difficult for the listener. to understand the.【28】which is being transmitted to him. The speaker who does not have specific words in his working vocabulary may be【29】to explain or describe in a【30】that can be understood by his listeners.
(41)
A.of
B.at
C.for
D.on
(36)
A.tastes
B.steps
C.stages
D.tests
Climate, like weather, changes【27】time. It is true【28】these changes【29】a long time, but not as long as we might expect. Records show that over the centuries large portions of the earth have experienced great changes【30】climate.
(36)
A.effects
B.defects
C.infects
D.affects
"That【23】a thief !" he thought, and he took his gun and shot【24】him. Then he went back to bed,【25】he was too frightened【26】of the house in the dark.
The next morning John went out and saw one【27】his white shirts hanging【28】the clothes line in the garden. His wife【29】washed it the day before and【30】it out to dry. Now it had a bullet hole right through the middle of it.
"My God," said John, "I was lucky last night. If I had been wearing that shirt, the bullet would have killed me!"
(46)
A.at
B.in
C.above
D.of
Most problems between teenagers and their parents yield best to (导致) joint planning and decision making. Within any particular family【25】are avoided and problems are solved when all of the persons take【26】in the situation,【27】in working it out.【28】parents and young people learn how to get【29】well with each other and develop skills in understanding and【30】understood, even the most difficult problems are relieved.
(36)
A.free
B.likely
C.able
D.curious