The rings are heavy.
The rings are heavy.
The Olympic rings are ____, _____ , ______, _______ and ______ in color.
The Olympic rings are ____, _____ , ______, _______ and ______ in color.
If the telephone rings, I will answer it.（)
If the telephone rings, I will answer it.（)
The piston rings are manufactured with a diameter （） the bore of the cylinder.
The piston rings are manufactured with a diameter （） the bore of the cylinder.
These piston rings are so badly worn that they must be （）.
These piston rings are so badly worn that they must be （）.
While watching TV, _________。 A: the doorbell rang B: the doorbell rings C: we heard the door bell ring D: we heard the door bell rings
While watching TV, _________。 A: the doorbell rang B: the doorbell rings C: we heard the door bell ring D: we heard the door bell rings
In western culture, wedding rings are worn on right hand.()
In western culture, wedding rings are worn on right hand.()
Among the rings of a piston the （） one is subjected to the greatest load and temperature.
Among the rings of a piston the （） one is subjected to the greatest load and temperature.
In the rings event, gymnasts are lifted up to reach four rings.
In the rings event, gymnasts are lifted up to reach four rings.
Either a low injection pressure or a leakage of piston rings is able to lead （）.
Either a low injection pressure or a leakage of piston rings is able to lead （）.