The cabin pressure is referred to as "psi" and indicates the differential pressure, in pounds per square inch, between inside and outside of the airplane. The above sentence means " 机舱压力简称为‘psid’，意即飞机内、外压力差由磅／平方英寸表示。"
A.1;正确答案A
The cabin pressure is referred to as "psi" and indicates the differential pressure, in pounds per square inch, between inside and outside of the airplane. The above sentence means " 机舱压力简称为‘psid’，意即飞机内、外压力差由磅／平方英寸表示。"
A.1;正确答案A
