根据酶在生物体内存在的部位，可分为胞内酶和胞外酶，下列属于胞外酶的是（）。 A.呼吸

大气环境影响预测的步骤是什么？

(选做题)生物柴油是一种可再生的清洁能源，其应用在一定程度上能够减缓人类对化石燃料的消耗。科学家发现，在微生物M产生的脂肪酶作用下，植物油与甲醇反应能够合成生物柴油(如下图)。

(1)用于生产生物柴油的植物油不易挥发，宜选用_______、_______方法从油料作物中提取。

(2)筛选产脂肪酶的微生物M时，选择培养基中添加的植物油为微生物生长提供______，培养基灭菌采用的最适方法是________法。

(3)测定培养液中微生物数量，可选用________法直接计数；从微生物M分离提取的脂肪酶通常需要检测________，以确定其应用价值；为降低生物柴油生产成本，可利用______技术使脂肪酶能够重复使用。

(4)若需克隆脂肪酶基因，可应用耐热DNA聚合酶催化的__________技术。

头颈部口颌系统的各肌肉之间，各组肌群之间都有密切联系，以链的方式互相连接着。

口颌肌链的临床意义不包括（）。

A.对颌骨的发育有明显作用

B.对牙弓的形成有明显作用

C.对的建立有明显作用

D.巨舌症破坏了水平肌链正常的肌力平衡

E.腭裂对垂直肌链不产生影响

A project management technique that is currently in widespread use is the (66) . The purpose of this technique is to detail, in hierarchical fashion, all of the activities that are required to meet project objectives. There are some special activities called (67) , which are events that signify the accomplishment or completion of major deliverables during the project. Most system development methodologies also provide (68) , whose purpose is to contain the various pieces of relevant information - feasibility assessments, schedules, needs analysis, and so forth - in a single place so that they can be presented to project clients and other related parties. Several types of important network diagrams are used in project management. (69) was developed to make clear the interdependence between project tasks before those tasks are scheduled. (70) offers the advantage of clearly showing overlapping tasks.

A. CPM B. Network Diagram
C. PERT D. Gantt chart

脂肪的CT值（）

A．0～20HU

B．30～60HU

C．-90～-60HU

D．1000HU

E．-1000HU