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【多选题】
P1口的Led 灯 从 高 位往 低 位移 点亮 P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0 P1 赋值 0 1 1 1 1 1 1 1 P1=? 1 0 1 1 1 1 1 1 P1=? 1 1 0 1 1 1 1 1 P1=? 1 1 1 0 1 1 1 1 P1=? 1 1 1 1 0 1 1 1 P1=? 1 1 1 1 1 0 1 1 P1=? 1 1 1 1 1 1 0 1 P1=? 1 1 1 1 1 1 1 0 P1=?A.
0111 1111；1011 1111；1101 1111；1110 1111；1111 0111；1111 1011；1111 1101；1111 1110
B.
{0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe}
C.
{0xfe,0xfc,0xf8,0xf0,0xe0,0xc0,0x80,0x00}
D.
{0x7f,0x3f,0x5f,0x6f,0x77,0x7b,0x7d,0x7e}
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【多选题】氮氧化物的危害包括什么?
A.
引起呼吸道阻力增加，纤毛运动减弱，肺吞噬细胞吞噬能力降低
B.
进入深部呼吸道的NO2，可形成亚硝酸及硝酸，对肺组织产生强烈的刺激与腐蚀作用，导致肺水肿
C.
NO2 在血液中形成的亚硝酸盐，可引起高铁血红蛋白血症和血管扩张，造成组织缺氧，出现发绀和呼吸困难
D.
NO2 与大气中的 SO2 和 O3 分别具有相加和协同作用，造成呼吸道阻力增加以及抗感染能力下降
【单选题】Even today,when air and road travel has made Africa so readily accessible to Europeans and Americans,there are innumerable aspects of African life which tend to take one by surprise. The unfamiliar li...
A.
This fact makes it easier to accept the unfamiliarity of West Africa.
B.
This fact makes West Africa seem even stranger.
C.
This fact makes no difference to our reaction to West Africa.
D.
This fact has been greatly overemphasized.
【简答题】A．On foot and by boat. B．By car and on foot. C．By air and by car. D．By air and by bus.
【简答题】A．On foot and by boat. B．By car and on foot. C．By air and by car. D．By air and by bus.
【单选题】Living near the sea, _____. [ ]
A.
we enjoy healthy air and beautiful sight
B.
healthy air and beautiful sight is what we enjoy
C.
it is healthy air and beautiful sight we enjoy
D.
so we enjoy healthy air and beautiful sight
【单选题】Which of the listed properties does warm air possess ().
A.
It rises above cooler air and cools as it rises
B.
Atmospheric pressure drops as warm air rises
C.
Moisture in warm air condenses as the air is cooled
D.
All of the above
【简答题】Planting trees around poultry farms can improve air and water quality -- and relations with neighbors. Research has shown that just three rows of trees near poultry houses can reduce the release of du...
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