When the alternate source of static pressure (vented inside an u

When the alternate source of static pressure (vented inside an unpressurized airplane) is used, _______ .

A.the altimeter may indicate higher than the actual altitude being flown

B.the airspeed indicator may indicate slower than the actual airspeed being flown

C.the turn needle may become inoperative

D.the vertical speed indicator may indicate a continuous descent

正确答案是A