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【单选题】
森林生态系统能长期维持相对稳定状态的原因是() ①生物多样性是自动调节能力的基础 ②其抵抗力稳定性要比草原生态系统高 ③其恢复力稳定性要比农田生态系统高 ④有比较复杂的营养结构 ⑤太阳能是维持生态系统正常运转的动力 ⑥能量可以随着季节的变化而产生波动 ⑦一种生物大量减少后,其位置可由同一营养级的多种生物取代 ⑧生产者和分解者构成生物圈无机物和有机物的循环回路
A.
①③⑤⑥⑧
B.
②③④⑥⑦
C.
①②④⑤⑦
D.
①③④⑤⑧
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【单选题】According to some weather signs, if the groundhog sees its shadow and returns to its den, it means that ______.
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spring is round the corner
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its genes.
B.
its habit.
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【单选题】大蒜具有的变态有 。
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B.
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【单选题】According to the first email, what is uncertain about the conference?
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【判断题】将场效应管有字的一面朝自己,从左至右管脚分别为栅极( G)、漏极(D)、源极(S)。
A.
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【多选题】大蒜具有的变态有 。
A.
叶变态
B.
茎变态
C.
根变态
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【单选题】与过敏反应产生有关的细胞是
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嗜酸性粒细胞
B.
巨噬细胞
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淋巴细胞
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E.
中性粒细胞
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【单选题】According to the speaker, the sleep pattern of a baby is determined by
A.
its genes.
B.
its habit.
C.
its mental state.
D.
its physical condition.
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【单选题】患者女性,28岁。初孕妇,妊娠32周。有妊娠期糖尿病,估计胎儿重3500g,在门诊做B超检查。下列常用来估计胎儿大小的径线是
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枕颏径
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【简答题】具有变态根的植物是________。 A马铃薯 B生姜 C大蒜 D红薯
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【单选题】According to some weather signs, if the groundhog sees its shadow and returns to its den, it means that ______.
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【单选题】According to the passage, the sleep pattern of a baby is determined by
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C.
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D.
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查看完整题目与答案
【单选题】大蒜具有的变态有 。
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叶变态
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【单选题】According to the first email, what is uncertain about the conference?
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【判断题】将场效应管有字的一面朝自己,从左至右管脚分别为栅极( G)、漏极(D)、源极(S)。
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正确
B.
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【多选题】大蒜具有的变态有 。
A.
叶变态
B.
茎变态
C.
根变态
查看完整题目与答案
【单选题】与过敏反应产生有关的细胞是
A.
嗜酸性粒细胞
B.
巨噬细胞
C.
淋巴细胞
D.
肥大细胞
E.
中性粒细胞
查看完整题目与答案
【单选题】According to the speaker, the sleep pattern of a baby is determined by
A.
its genes.
B.
its habit.
C.
its mental state.
D.
its physical condition.
查看完整题目与答案
【单选题】患者女性,28岁。初孕妇,妊娠32周。有妊娠期糖尿病,估计胎儿重3500g,在门诊做B超检查。下列常用来估计胎儿大小的径线是
A.
双颞径
B.
双顶径
C.
枕颏径
D.
枕额径
E.
枕下前囟径
查看完整题目与答案