皮皮学，免费搜题
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【单选题】
听力原文：W: Has John known the news? M: If he had been at the picnic yesterday, he would have heard about it. What do we learn from the conversation?A.
John hasn't heard about the news.
B.
John was at the picnic yesterday.
C.
John wasn't at the picnic, but he has known the news.
D.
John was at the picnic, but he didn't hear about the news.
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皮皮学刷刷变学霸
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【简答题】放在粗糙水平面上同时受到两个方向相反的水平力 F 1 = 6 N 和 F 2 = 2 N 作用的物体处于静止状态。若撤去力 F 1 ,则物体所受合力大小为
【单选题】瓜类 插接时,用竹签紧贴南瓜子叶叶柄中脉基部向另一子叶叶柄基部成斜插 。插孔深约( )cm,竹签即将穿透砧木苗表皮,手指有触感为宜,竹签暂不拔出。
A.
0-10° ，0.5
B.
30～45° ， 约0.8
C.
90°，0。6
D.
90-180 °.0.5
【单选题】瓜类 插接时,用竹签紧贴南瓜子叶叶柄中脉基部向另一子叶叶柄基部成斜插 。插孔深约 ( )cm,竹签即将穿透砧木苗表皮,手指有触感为宜,竹签暂不拔出。
A.
10° ，0.5
B.
0-10° ，1.0
C.
30～45°，0.8
D.
90°，0.5
【简答题】行政机关在行政执法和查办案件过程中收集的证据材料,在刑事诉讼中( )作为证据使用。