自动扶梯的安全保护装置主要有以下（）。
A、电磁制动器ABCD
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Onlywhenyouhaveobtainedsufficientdata________cometoasoundconclusion.
Thepoorcountriesareextremely_______tointernationaleconomicfluctuations
TheTVstation,in________tomassivepopulardemand,decidedtocontinuethesoapopera(肥皂剧).
GeneralMotors,oneoftheworld'slargestautomanufacturers,isexpandingits________inthiscountry.
Themorewelookedatthepicture,________.
