眉头、内眼角和鼻翼应在（）。A、斜向连接点上 B、30°角上 C、同一垂直线上 D、

He has _________ friends here because he is always friendly.

A．quite few

B．quite little

C．quite a few

D．quite a little

______A．雪山连绵，冰川广布           a．云贵高原

______B．地面坦荡，一望无际            b．黄土高原

______C．千沟万壑，支离破碎            c．内蒙古高原

______D．地面崎岖，峰岭众多            d．青藏高原

______E．三河冲积而成                  e．长江中下游平原

______F．巫山以东，地势低平、狭长      f．华北平原

______G．地势平坦，一望无际            g．东北平原．

化学与环境、材料、信息、能源关系密切，下列说法不正确的是

A．高铁酸钾(K₂FeO₄)是一种新型、高效、多功能水处理剂，既能杀菌消毒又能净水

B．“光化学烟雾”、“臭氧空洞”的形成都与氮氧化合物有关

C．尽量使用含¹²C的产品，减少使用含¹³C或¹⁴C的产品符合“促进低碳经济”宗旨

D．高纯度的二氧化硅广泛用于制作光导纤维，光导纤维遇强碱会“断路”

The signal for a fire emergency on an OSV is（）.

A.a 30 second on 30 second off alternating signal

B.the continuous blast of the ships whistle for not less than 10 seconds supplemented by the continuous ringing of the general alarm bells for not less than 10 seconds

C.an intermittent ringing of the general alarm for not less than ten seconds

D.announced over the PA system