Since all the probes and vanes are exposed to the airstream, internal heating is provided to prevent ice formation. The above sentence means "由于以上探头和传感器都暴露在气流中，所以都采用了内部加温的办法进行防冰。"
A.1;
正确答案是A
Since all the probes and vanes are exposed to the airstream, internal heating is provided to prevent ice formation. The above sentence means "由于以上探头和传感器都暴露在气流中，所以都采用了内部加温的办法进行防冰。"
A.1;
正确答案是A