_____uses one or two high pressure pumps for all the cylinders with one more____ standby, while______have a separate high－pressure pump for each cylinder.

A high temperature alarm or _____ which will melt is used to guard against the explosion of compressor air pipelines.

Having two eyes, instead of one, is particularly useful for ______.A．seeing at nightB．seei

There are_____I want to tell you.A．one or two thingsB．either one thing or another thingC．n

Here are some books. You can ______ one or two for your little girl. A. pick out B.

______ is a process of combining two or more words into one lexical unit.A．DerivationB．Ble

There are one or two minor differences, but they are ________ the same text.A substa