Flight compartment windows are electrically heated. The windshield wipers and rain repellent are used for providing clear vision. In the above sentence ,起到提高能见度的部件有：
A.a.风挡雨刷
B.b.排雨剂
C.c.驾驶舱玻璃
D.d.a+b
正确答案是D
Flight compartment windows are electrically heated. The windshield wipers and rain repellent are used for providing clear vision. In the above sentence ,起到提高能见度的部件有：
A.a.风挡雨刷
B.b.排雨剂
C.c.驾驶舱玻璃
D.d.a+b
正确答案是D