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.风挡雨刷 ;
B.排雨剂
C.驾驶舱玻璃
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.风挡雨刷 ;
B.排雨剂
C.驾驶舱玻璃
D..a+b;
正确答案是D