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【单选题】
下列说法中错误的是 。A.
倒圆角可避免零件轴肩处的应力集中
B.
退刀槽和砂轮越程槽的设计是为了测量精确，保证加工质量
C.
钻孔时，钻头的轴线应与被加工表面垂直
D.
凸台和凹坑可减少加工面积，并保证接触好
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【单选题】妊娠母猪咳嗽，发热，继而流产。取流产胎儿脑组织接种兔，兔出现奇痒后死亡。该病最可能是
A.
猪瘟病毒
B.
猪圆环病毒
C.
猪细小病毒
D.
伪狂犬病毒
E.
猪繁殖与呼吸综合征病毒
【单选题】Our teacher asked me ________.
A.
what was Ann doing these days
B.
why didn’t Peter come to school the day before
C.
when will the dolphin show begin
D.
how long I usually spent on my homework
【单选题】The loud noise outside ______ our teacher’s voice so that we didn’t ______ what he was saying. [ ]
A.
put out; hear
B.
drowned; make out
C.
cut out; recognize
D.
threw away; know
【单选题】Our teacher asked me ________. [ ]
A.
what was Ann doing these days
B.
why Peter didn’t come to school the day before
C.
when will the dolphin show begin
D.
how long I usually spent on my homework
【单选题】i didn’t like our new english teacher, and ____.
A.
neither did my classmates
B.
neither my classmates did
C.
my classmates don’t too
D.
my classmates did not also
【简答题】对急性重型肝炎评价临床抢救效果时最恰当的指标应是
【单选题】妊娠母猪咳嗽,发热,继而流产。取流产胎儿脑组织接种兔,兔出现奇痒后死亡。该病原最可能是(2018真题上162)
A.
猪瘟病毒
B.
猪圆环病毒
C.
猪细小病毒
D.
伪狂犬病病毒
E.
猪繁殖与呼吸综合征病毒
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