不要让压力小于(或大于)20psi。
A.Do not make the pressure became less than (or more than)20 psi. B.Do not let the pressure become less than (or more than)20 psi. C.Do not let the pressure close less than (or more than) 20 psi.正确答案B
不要让压力小于(或大于)20psi。
A.Do not make the pressure became less than (or more than)20 psi. B.Do not let the pressure become less than (or more than)20 psi. C.Do not let the pressure close less than (or more than) 20 psi.正确答案B
