皮皮学，免费搜题
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【多选题】
以下哪些属于免费式商业模式的类型？（ ）A.
“免费＋广告”模式
B.
“免费＋增值服务收费”模式
C.
“免费＋隐性收费”模式
D.
“免费＋赠送”模式
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
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B.
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